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How to Cite: During and After

Two techniques of citing and documenting sources that are usually required in academic writing are:

• Providing a list of citations at the end of the paper
• Citing within the text of the paper

These two techniques are used together.

Cite At the End

Cite as you write.

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A publication of the harvard college writing program.

Harvard Guide to Using Sources 

• The Honor Code
• In-Text Citations

In APA style, you use parenthetical citations within the text of your paper to credit your sources, to show how recently your sources were published, and to refer your reader to a more detailed citation of the source in the reference list at the end of your paper. You should use parenthetical citations when you paraphrase, quote, or make any reference to another author's work. A parenthetical citation in APA style includes the author's last name as well as the year in which the work was published, with a comma between them. If you are referring directly to a specific page in the source, you should also include the page number in your parenthetical citation. APA requires you to cite page numbers when you are quoting directly from the source. If you are paraphrasing, which is more common in the social sciences, you generally do not need to include a page number. If you have questions about whether you should include page numbers when citing in APA, you should consult your instructor.

If you mention the author's name and/or the year of publication in the sentence preceding the citation, you do not need to include them in the parenthetical citation. When you name the author in the sentence, you should include the publication year in parentheses right after the author’s name—do not wait until the end of the sentence to provide that information.

When you include a parenthetical citation at the end of a sentence, the punctuation for your sentence appears after the citation.

Citing author and date in a parenthetical citation

When you don’t mention either the author or the date of publication in your sentence, you should include both the author and the year, separated by a comma, in the parenthetical citation. 

Colleges and universities need to create policies that foster inclusion for low-income students (Jack, 2019).         

Citing when author’s name is mentioned in body of paper

When you mention the author’s name in your sentence, the year of publication should immediately follow the author’s name.

Anthony Jack’s (2019) study of low-income students on an elite college campus revealed that these schools are often unprepared to support the students they admit.

Jack (2019) studied the ways low-income students experience elite college campuses.

Citing page numbers

When you cite a direct quote from the source or paraphrase a specific point from the source, you should include the page number in the parenthetical citation at the end of the sentence. When you refer to a specific page or pages of the text, first list the year of publication and then list "p." followed by the page number or "pp." followed by the range of pages. If you refer to a specific chapter, indicate that chapter after the year.              

The author contends that “higher education in America is highly unequal and disturbingly stratified” (Jack, 2019, p. 4).

Jack (2019) contends that “higher education in America is highly unequal and disturbingly stratified” (p. 4).

Citing sources with more than one author

When you cite a source that has two authors, you should separate their names with an ampersand in the parenthetical citation.

The authors designed a study to determine if social belonging can be encouraged among college students (Walton & Cohen, 2011). 

If a work has three or more authors , you should only include the first author's name followed by et al. ( Et al. is the shortened form of the Latin et alia , which means “and others.”)

The implementation of postpartum contraceptive programs is both costly and time consuming (Ling et al., 2020).

Attributing a point to more than one source  

To attribute a point or idea to multiple sources, list them in one parenthetical citation, ordered alphabetically by author and separated by semicolons. Works by the same author should be ordered chronologically, from oldest to most recent, with the publication dates separated by commas.

Students who possess cultural capital, measured by proxies like involvement in literature, art, and classical music, tend to perform better in school (Bourdieu & Passeron, 1977; Dumais, 2002; Orr, 2003).

Citing multiple works by the same author 

If your reference list includes multiple works by the same author in the same year, identify them in your parenthetical citations and in your reference list by a lowercase letter after the year, assigning each letter in alphabetical order by the title of the work. When establishing the alphabetical order of works in your reference list, do not count the words "A" or "The" when they appear as the first word in a title.

One union-endorsed candidate publicly disagreed with the teachers' union on a number of issues (Borsuk, 1999a).

Citing multiple authors with the same last name        

If your reference list includes sources by multiple authors with the same last name, list each author's initials before their last name, even when the works were published in different years.

The question of whether a computer can be considered an author has been asked for longer than we might expect (B. Sobel, 2017).

Citing when no author is listed           

To refer to a work that is listed in your reference list by title rather than by author, cite the title or the first few words of the title.

The New York Times painted a bleak picture of the climate crisis (“Climate Change Is Not Negotiable,” 2022).

Citing when no date is listed

If the work you are citing has no date listed, you should put “n.d.” for “no date” in the parenthetical citation.

Writing research papers is challenging (Lam, n.d.). 

Citing a specific part of a source that is not a page number

To refer to a specific part of a source other than page number, add that after the author-date part of your citation. If it is not clear whether you are referring to a chapter, a paragraph, a time stamp, or a slide number, or other labeled part of a source, you should indicate the part you are referring to (chapter, para., etc.).

In the Stranger Things official trailer, the audience knows that something unusual is going to happen from the moment the boys get on their bicycles to ride off into the night (Duffer & Duffer, 0:16).

• Citation Management Tools
• Reference List Format
• Examples of Commonly Cited Sources
• Frequently Asked Questions About Cite Sources in APA Format
• Sample Reference List

PDFs for This Section

• Citing Sources
• Online Library and Citation Tools

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• Research Guides

Format Your Paper & Cite Your Sources

• APA Style, 7th Edition
• Citing Sources
• Avoid Plagiarism
• MLA Style (8th/9th ed.)

APA Tutorial

Formatting your paper, headings organize your paper (2.27), video tutorials, reference list format (9.43).

• Elements of a Reference

Reference Examples (Chapter 10)

Dois and urls (9.34-9.36), in-text citations.

• In-Text Citations Format
• In-Text Citations for Specific Source Types

NoodleTools

• Chicago Style
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• Other Styles
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• How to Create an Attribution

What is APA Style?

APA style was created by social and behavioral scientists to standardize scientific writing. APA style is most often used in:

• psychology,
• social sciences (sociology, business), and

If you're taking courses in any of these areas, be prepared to use APA style.

For in-depth guidance on using this citation style, refer to Publication Manual of the American Psychological Association , 7th ed. We have several copies available at the MJC Library at the call number  BF 76.7 .P83 2020 .

APA Style, 7th ed.

In October 2019, the American Psychological Association made radical changes its style, especially with regard to the format and citation rules for students writing academic papers. Use this guide to learn how to format and cite your papers using APA Style, 7th edition.

You can start by viewing the  video tutorial .

For help on all aspects of formatting your paper in APA Style, see   The Essentials  page on the APA Style website.

• sans serif fonts such as 11-point Calibri, 11-point Arial, or 10-point Lucida Sans Unicode, or
• serif fonts such as 12-point Times New Roman, 11-point Georgia, or normal (10-point) Computer Modern (the default font for LaTeX)
• There are exceptions for the  title page ,  tables ,  figures ,  footnotes , and  displayed equations .
• Margins :  Use 1-in. margins on every side of the page.
• Align the text of an APA Style  paper to the left margin . Leave the right margin uneven, or “ragged.”
• Do not use full justification for student papers.
• Do not insert hyphens (manual breaks) in words at the end of line. However, it is acceptable if your word-processing program automatically inserts breaks in long hyperlinks (such as in a DOI or URL in a reference list entry).
• Indent the first line of each paragraph of text 0.5 in . from the left margin. Use the tab key or the automatic paragraph-formatting function of your word-processing program to achieve the indentation (the default setting is likely already 0.5 in.). Do not use the space bar to create indentation. 
• There are exceptions for the  title page ,  section labels ,  abstract ,  block quotations ,  headings ,  tables and figures ,  reference list , and  appendices .

Paper Elements

Student papers generally include, at a minimum: 

• Title Page (2.3)
• Text (2.11)
• References  (2.12)

Student papers may include additional elements such as tables and figures depending on the assignment. So, please check with your teacher!

Student papers generally  DO NOT  include the following unless your teacher specifically requests it:

• Running head
• Author note

For complete information on the  order of pages , see the APA Style website.

Number your pages consecutively starting with page 1. Each section begins on a new page. Put the pages in the following order:

• Page 1: Title page
• Page 2: Abstract (if your teacher requires an abstract)
• Page 3: Text 
• References begin on a new page after the last page of text
• Footnotes begin on a new page after the references (if your teacher requires footnotes)
• Tables begin each on a new page after the footnotes (if your teacher requires tables) 
• Figures begin on a new page after the tables (if your teacher requires figures)
• Appendices begin on a new page after the tables and/or figures (if your teacher requires appendices)

Sample Papers With Built-In Instructions

To see what your paper should look like, check out these sample papers with built-in instructions.

APA Style uses five (5) levels of headings to help you organize your paper and allow your audience to identify its key points easily. Levels of headings establish the hierarchy of your sections just like you did in your paper outline.

APA tells us to use "only the number of headings necessary to differentiate distinct section in your paper." Therefore, the number of heading levels you create depends on the length and complexity of your paper.

See the chart below for instructions on formatting your headings:

Use Word to Format Your Paper:

Use Google Docs to Format Your Paper:

Placement:  The reference list  appears at the end of the paper, on its own page(s). If your research paper ends on page 8, your References begin on page 9.

Heading:  Place the section label References  in bold at the top of the page, centered.

Arrangement:  Alphabetize entries by author's last name. If source has no named author, alphabetize by the title, ignoring A, An, or The. (9.44-9.48)

Spacing:  Like the rest of the APA paper, the reference list is double-spaced throughout. Be sure NOT to add extra spaces between citations.

Indentation:  To make citations easier to scan, add a  hanging indent  of 0.5 in. to any citation that runs more than one line. Use the paragraph-formatting function of your word processing program to create your hanging indent.  

See Sample References Page (from APA Sample Student Paper):

Elements of Reference List Entries: (Chapter 9)

References generally have four elements, each of which has a corresponding question for you to answer:

• Author:   Who is responsible for this work? (9.7-9.12)
• Date:   When was this work published? (9.13-9.17)
• Title:   What is this work called? (9.18-9.22)
• Source:   Where can I retrieve this work? (9.23-9.37)

By using these four elements and answering these four questions, you should be able to create a citation for any type of source.

For complete information on all of these elements, checkout the APA Style website.

This infographic shows the first page of a journal article. The locations of the reference elements are highlighted with different colors and callouts, and the same colors are used in the reference list entry to show how the entry corresponds to the source.

To create your references, you'll simple look for these elements in your source and put them together in your reference list entry.

American Psychological Association.  Example of where to find reference information for a journal article  [Infographic]. APA Style Center. https://apastyle.apa.org/style-grammar-guidelines/references/basic-principles

Below you'll find two printable handouts showing APA citation examples. The first is an abbreviated list created by MJC Librarians. The second, which is more comprehensive, is from the APA Style website. Feel free to print these for your convenience or use the links to reference examples below:

• APA Citation Examples Created by MJC Librarians for you.
• Common References Examples (APA Handout) Printable handout from the American Psychological Association.
• Journal Article
• Magazine Article
• Newspaper Article
• Edited Book Chapter
• Webpage on a Website

Classroom or Intranet Sources

• Classroom Course Pack Materials
• How to Cite ChatGPT
• Dictionary Entry
• Government Report
• Legal References (Laws & Cases)
• TED Talk References
• Religious Works
• Open Educational Resources (OER)
• Archival Documents and Collections

You can view the entire Reference Examples website below and view a helpful guide to finding useful APA style topics easily:

• APA Style: Reference Examples
• Navigating the not-so-hidden treasures of the APA Style website
• Missing Reference Information

Sometimes you won't be able to find all the elements required for your reference. In that case, see the  instructions in Table 9.1 of the APA style manual in section 9.4 or the APA Style website below:

• Direct Quotation of Material Without Page Numbers

The DOI or URL is the final component of a reference list entry. Because so much scholarship is available and/or retrieved online, most reference list entries end with either a DOI or a URL.

• A  DOI  is a unique alphanumeric string that identifies content and provides a persistent link to its location on the internet. DOIs can be found in database records and the reference lists of published works.
• A  URL  specifies the location of digital information on the internet and can be found in the address bar of your internet browser. URLs in references should link directly to the cited work when possible.

When to Include DOIs and URLs:

• Include a DOI for all works that have a DOI, regardless of whether you used the online version or the print version.
• If an online work has both a DOI and a URL, include only the DOI.
• For works without DOIs from websites (not including academic research databases), provide a URL in the reference (as long as the URL will work for readers).
• For works without DOIs from most academic research databases, do not include a URL or database information in the reference because these works are widely available. The reference should be the same as the reference for a print version of the work.
• For works from databases that publish original, proprietary material available only in that database (such as the UpToDate database) or for works of limited circulation in databases (such as monographs in the ERIC database), include the name of the database or archive and the URL of the work. If the URL requires a login or is session-specific (meaning it will not resolve for readers), provide the URL of the database or archive home page or login page instead of the URL for the work. (See APA Section 9.30 for more information). 
• If the URL is no longer working or no longer provides readers access to the content you intend to cite, try to find an archived version using the Internet Archive , then use the archived URL. If there is no archived URL, do not use that resource.

Format of DOIs and URLs:

Your DOI should look like this: 

https://doi.org/10.1037/a0040251

Follow these guidelines from the APA Style website.

APA Style uses the  author–date citation system , in which a brief in-text citation points your reader to the full reference list entry at the end of your paper. The in-text citation appears within the body of the paper and briefly identifies the cited work by its author and date of publication. This method enables your reader to locate the corresponding entry in the alphabetical reference list at the end of your paper.

Each work you cite  must  appear in the reference list, and each work in the reference list must be cited in the text (or in a table, figure, footnote, or appendix) except for the following (See APA, 8.4):

• Personal communications (8.9)
• General mentions of entire websites, whole periodicals (8.22), and common software and apps (10.10) in the text do not require a citation or reference list entry.
• The source of an epigraph does not usually appear in the reference list (8.35)
• Quotations from your research participants do not need citations or reference list entries (8.36)
• References included in a statistical meta-analysis, which are marked with an asterisk in the reference list, may be cited in the text (or not) at the author’s discretion. This exception is relevant only to authors who are conducting a meta-analysis (9.52).

Formatting Your In-Text Citations

Parenthetical and Narrative Citations: ( See APA Section  8.11)

In APA style you use the author-date citation system for citing references within your paper. You incorporate these references using either a  parenthetical   or a  narrative  style.

Parenthetical Citations

• In parenthetical citations, the author name and publication date appear in parentheses, separated by a comma. (Jones, 2018)
• A parenthetical citation can appear within or at the end of a sentence.
• When the parenthetical citation is at the end of the sentence, put the period or other end punctuation after the closing parenthesis.
• If there is no author, use the first few words of the reference list entry, usually the "Title" of the source: ("Autism," 2008) See APA 8.14
• When quoting, always provide the author, year, and specific page citation or paragraph number for nonpaginated materials in the text (Santa Barbara, 2010, p. 243).  See APA 8.13
• For most citations, the parenthetical reference is placed BEFORE the punctuation: Magnesium can be effective in treating PMS (Haggerty, 2012).

Narrative Citations 

In narrative citations, the author name or title of your source appears within your text and the publication date appears in parentheses immediately after the author name. 

• Santa Barbara (2010) noted a decline in the approval of disciplinary spanking of 26 percentage points from 1968 to 1994.

In-Text Citation Checklist

• In-Text Citation Checklist Use this useful checklist from the American Psychological Association to ensure that you've created your in-text citations correctly.

In-Text Citations for Specific Types of Sources

Quotations from Research Participants

Personal Communications

Secondary Sources  

Use NoodleTools to Cite Your Sources  

NoodleTools can help you create your references and your in-text citations.

• NoodleTools Express No sign in required . When you need one or two quick citations in MLA, APA, or Chicago style, simply generate them in NoodleTools Express then copy and paste what you need into your document. Note: Citations are not saved and cannot be exported to a word processor using NoodleTools Express.
• NoodleTools (Login Full Database) This link opens in a new window Create and organize your research notes, share and collaborate on research projects, compose and error check citations, and complete your list of works cited in MLA, APA, or Chicago style using the full version of NoodleTools. You'll need to Create a Personal ID and password the first time you use NoodleTools.

See How to Use NoodleTools Express to Create a Citation in APA Format

Additional NoodleTools Help

• NoodleTools Help Desk Look up questions and answers on the NoodleTools Web site
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• Referencing

A Quick Guide to Harvard Referencing | Citation Examples

Published on 14 February 2020 by Jack Caulfield . Revised on 15 September 2023.

Referencing is an important part of academic writing. It tells your readers what sources you’ve used and how to find them.

Harvard is the most common referencing style used in UK universities. In Harvard style, the author and year are cited in-text, and full details of the source are given in a reference list .

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Table of contents

Harvard in-text citation, creating a harvard reference list, harvard referencing examples, referencing sources with no author or date, frequently asked questions about harvard referencing.

A Harvard in-text citation appears in brackets beside any quotation or paraphrase of a source. It gives the last name of the author(s) and the year of publication, as well as a page number or range locating the passage referenced, if applicable:

Note that ‘p.’ is used for a single page, ‘pp.’ for multiple pages (e.g. ‘pp. 1–5’).

An in-text citation usually appears immediately after the quotation or paraphrase in question. It may also appear at the end of the relevant sentence, as long as it’s clear what it refers to.

When your sentence already mentions the name of the author, it should not be repeated in the citation:

Sources with multiple authors

When you cite a source with up to three authors, cite all authors’ names. For four or more authors, list only the first name, followed by ‘ et al. ’:

Sources with no page numbers

Some sources, such as websites , often don’t have page numbers. If the source is a short text, you can simply leave out the page number. With longer sources, you can use an alternate locator such as a subheading or paragraph number if you need to specify where to find the quote:

Multiple citations at the same point

When you need multiple citations to appear at the same point in your text – for example, when you refer to several sources with one phrase – you can present them in the same set of brackets, separated by semicolons. List them in order of publication date:

Multiple sources with the same author and date

If you cite multiple sources by the same author which were published in the same year, it’s important to distinguish between them in your citations. To do this, insert an ‘a’ after the year in the first one you reference, a ‘b’ in the second, and so on:

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A bibliography or reference list appears at the end of your text. It lists all your sources in alphabetical order by the author’s last name, giving complete information so that the reader can look them up if necessary.

The reference entry starts with the author’s last name followed by initial(s). Only the first word of the title is capitalised (as well as any proper nouns).

Sources with multiple authors in the reference list

As with in-text citations, up to three authors should be listed; when there are four or more, list only the first author followed by ‘ et al. ’:

Reference list entries vary according to source type, since different information is relevant for different sources. Formats and examples for the most commonly used source types are given below.

• Entire book
• Book chapter
• Translated book
• Edition of a book

Journal articles

• Print journal
• Online-only journal with DOI
• Online-only journal with no DOI

• General web page
• Online article or blog
• Social media post

Sometimes you won’t have all the information you need for a reference. This section covers what to do when a source lacks a publication date or named author.

No publication date

When a source doesn’t have a clear publication date – for example, a constantly updated reference source like Wikipedia or an obscure historical document which can’t be accurately dated – you can replace it with the words ‘no date’:

Note that when you do this with an online source, you should still include an access date, as in the example.

When a source lacks a clearly identified author, there’s often an appropriate corporate source – the organisation responsible for the source – whom you can credit as author instead, as in the Google and Wikipedia examples above.

When that’s not the case, you can just replace it with the title of the source in both the in-text citation and the reference list:

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Harvard referencing uses an author–date system. Sources are cited by the author’s last name and the publication year in brackets. Each Harvard in-text citation corresponds to an entry in the alphabetised reference list at the end of the paper.

Vancouver referencing uses a numerical system. Sources are cited by a number in parentheses or superscript. Each number corresponds to a full reference at the end of the paper.

A Harvard in-text citation should appear in brackets every time you quote, paraphrase, or refer to information from a source.

The citation can appear immediately after the quotation or paraphrase, or at the end of the sentence. If you’re quoting, place the citation outside of the quotation marks but before any other punctuation like a comma or full stop.

In Harvard referencing, up to three author names are included in an in-text citation or reference list entry. When there are four or more authors, include only the first, followed by ‘ et al. ’

Though the terms are sometimes used interchangeably, there is a difference in meaning:

• A reference list only includes sources cited in the text – every entry corresponds to an in-text citation .
• A bibliography also includes other sources which were consulted during the research but not cited.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

Caulfield, J. (2023, September 15). A Quick Guide to Harvard Referencing | Citation Examples. Scribbr. Retrieved 17 June 2024, from https://www.scribbr.co.uk/referencing/harvard-style/

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Citation Styles Guide | Examples for All Major Styles

Published on June 24, 2022 by Jack Caulfield . Revised on November 7, 2022.

A citation style is a set of guidelines on how to cite sources in your academic writing . You always need a citation whenever you quote , paraphrase , or summarize a source to avoid plagiarism . How you present these citations depends on the style you follow. Scribbr’s citation generator can help!

Different styles are set by different universities, academic associations, and publishers, often published in an official handbook with in-depth instructions and examples.

There are many different citation styles, but they typically use one of three basic approaches: parenthetical citations , numerical citations, or note citations.

Parenthetical citations

• Chicago (Turabian) author-date

CSE name-year

Numerical citations

CSE citation-name or citation-sequence

Note citations

• Chicago (Turabian) notes and bibliography

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Table of contents

Types of citation: parenthetical, note, numerical, which citation style should i use, parenthetical citation styles, numerical citation styles, note citation styles, frequently asked questions about citation styles.

The clearest identifying characteristic of any citation style is how the citations in the text are presented. There are three main approaches:

• Parenthetical citations: You include identifying details of the source in parentheses in the text—usually the author’s last name and the publication date, plus a page number if relevant ( author-date ). Sometimes the publication date is omitted ( author-page ).
• Numerical citations: You include a number in brackets or in superscript, which corresponds to an entry in your numbered reference list.
• Note citations: You include a full citation in a footnote or endnote, which is indicated in the text with a superscript number or symbol.

Citation styles also differ in terms of how you format the reference list or bibliography entries themselves (e.g., capitalization, order of information, use of italics). And many style guides also provide guidance on more general issues like text formatting, punctuation, and numbers.

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The AI-powered Citation Checker helps you avoid common mistakes such as:

• Missing commas and periods
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• Ampersands (&) in narrative citations
• Missing reference entries

In most cases, your university, department, or instructor will tell you which citation style you need to follow in your writing. If you’re not sure, it’s best to consult your institution’s guidelines or ask someone. If you’re submitting to a journal, they will usually require a specific style.

Sometimes, the choice of citation style may be left up to you. In those cases, you can base your decision on which citation styles are commonly used in your field. Try reading other articles from your discipline to see how they cite their sources, or consult the table below.

The American Anthropological Association (AAA) recommends citing your sources using Chicago author-date style . AAA style doesn’t have its own separate rules. This style is used in the field of anthropology.

APA Style is defined by the 7th edition of the Publication Manual of the American Psychological Association . It was designed for use in psychology, but today it’s widely used across various disciplines, especially in the social sciences.

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The citation style of the American Political Science Association (APSA) is used mainly in the field of political science.

The citation style of the American Sociological Association (ASA) is used primarily in the discipline of sociology.

Chicago author-date

Chicago author-date style is one of the two citation styles presented in the Chicago Manual of Style (17th edition). It’s used mainly in the sciences and social sciences.

The citation style of the Council of Science Editors (CSE) is used in various scientific disciplines. It includes multiple options for citing your sources, including the name-year system.

Harvard style is often used in the field of economics. It is also very widely used across disciplines in UK universities. There are various versions of Harvard style defined by different universities—it’s not a style with one definitive style guide.

Check out Scribbr’s Harvard Reference Generator

MLA style is the official style of the Modern Language Association, defined in the MLA Handbook (9th edition). It’s widely used across various humanities disciplines. Unlike most parenthetical citation styles, it’s author-page rather than author-date.

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The American Chemical Society (ACS) provides guidelines for a citation style using numbers in superscript or italics in the text, corresponding to entries in a numbered reference list at the end. It is used in chemistry.

The American Medical Association ( AMA ) provides guidelines for a numerical citation style using superscript numbers in the text, which correspond to entries in a numbered reference list. It is used in the field of medicine.

CSE style includes multiple options for citing your sources, including the citation-name and citation-sequence systems. Your references are listed alphabetically in the citation-name system; in the citation-sequence system, they appear in the order in which you cited them.

The Institute of Electrical and Electronics Engineers ( IEEE ) provides guidelines for citing your sources with IEEE in-text citations that consist of numbers enclosed in brackets, corresponding to entries in a numbered reference list. This style is used in various engineering and IT disciplines.

The National Library of Medicine (NLM) citation style is defined in Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers (2nd edition).

Vancouver style is also used in various medical disciplines. As with Harvard style, a lot of institutions and publications have their own versions of Vancouver—it doesn’t have one fixed style guide.

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The Bluebook: A Uniform System of Citation is the main style guide for legal citations in the US. It’s widely used in law, and also when legal materials need to be cited in other disciplines.

Chicago notes and bibliography

Chicago notes and bibliography is one of the two citation styles presented in the Chicago Manual of Style (17th edition). It’s used mainly in the humanities.

The Oxford University Standard for the Citation of Legal Authorities ( OSCOLA ) is the main legal citation style in the UK (similar to Bluebook for the US).

There are many different citation styles used across different academic disciplines, but they fall into three basic approaches to citation:

• Parenthetical citations : Including identifying details of the source in parentheses —usually the author’s last name and the publication date, plus a page number if available ( author-date ). The publication date is occasionally omitted ( author-page ).
• Numerical citations: Including a number in brackets or superscript, corresponding to an entry in your numbered reference list.
• Note citations: Including a full citation in a footnote or endnote , which is indicated in the text with a superscript number or symbol.

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

• APA Style is the most popular citation style, widely used in the social and behavioral sciences.
• MLA style is the second most popular, used mainly in the humanities.
• Chicago notes and bibliography style is also popular in the humanities, especially history.
• Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

A scientific citation style is a system of source citation that is used in scientific disciplines. Some commonly used scientific citation styles are:

• Chicago author-date , CSE , and Harvard , used across various sciences
• ACS , used in chemistry
• AMA , NLM , and Vancouver , used in medicine and related disciplines
• AAA , APA , and ASA , commonly used in the social sciences

APA format is widely used by professionals, researchers, and students in the social and behavioral sciences, including fields like education, psychology, and business.

Be sure to check the guidelines of your university or the journal you want to be published in to double-check which style you should be using.

MLA Style  is the second most used citation style (after APA ). It is mainly used by students and researchers in humanities fields such as literature, languages, and philosophy.

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APA Format for End References

APA format is the official style used by the   American Psychological Association .

APA style is used primarily in the social sciences and communicates data in a concise style that precisely describes material, makes the relationship between ideas or data as clear as possible, is generally in the active voice, and utilizes the past tense. In addition to being scientific and precise, you must use bias-free and inclusive language when writing in APA style. Your role is to be objective, to be conscious of word choice, and to avoid discriminatory language.

The font should remain the same throughout the paper. Options include 11-point sans-serif fonts, such as Calibri or Arial, and 12-point serif fonts, such as Times New Roman. Ultimately, check with your instructors about their font preferences. All text, including block quotes and the references section, should be double spaced.

Title pages include the paper title (in bold) followed by an extra space, the author (your name), affiliation (department and college), course number and name, instructor, and due date.

Crediting Sources

In-text citations.

In-text citations are included in the body of the paper. They identify the source by the author and its date of publication. Citations always correspond with an entry in the references section at the end of the paper. The two types of in-text citations,  narrative  and  parenthetical,  are shown below in the  paraphrase  and  direct   quotation  examples.

Paraphrasing means summarizing relevant information from a source. This method of borrowing is more commonly used in APA papers than quotations because it allows a writer to maintain their objective voice and combine the source’s ideas with their own. Paraphrases are always cited both in the text of the paper and in the reference page.

Paraphrase example using the narrative citation method

Rogers (1994) compared younger and older adults’ perceptions of economic stress.

Paraphrase example using the parenthetical citation method

The citation information is included at the end of the paraphrase in parenthesis.

In some instances, the hierarchical level at which employees worked significantly impacted their behavior in work groups (Mellers, Ortiz, & Smoot, 2006).

Direct Quotations

Direct quotations are limited in APA style papers. Instead, you should paraphrase whenever possible to blend borrowed information with your context and voice. The   APA Publication Manual, 7 th   Edition   notes that a writer should use direct quotations “when reproducing an exact definition, when an author has said something memorably or succinctly, or when you want to respond to exact wording.” The author, years, and page number (or section identifier) is always paired with quoted material through the narrative or parenthetical citation format.

Short quotation example

This example uses the parenthetical in-text citation format.

In several double-blind experiments, "'the placebo effect' . . . disappeared when behaviors were studied in this manner" (Miele, 1993, p. 276).

Reference(s)

McCauley, S. M., & Christiansen, M. H. (2019). Language learning as language use: A cross-linguistic model of child language development.   Psychological Review, 126 (1),   1-51. http://doi.org/10.1037/rev0000126

Parenthetical citation:   (McCauley & Christiansen, 2019)

Narrative citation:   McCauley and Christiansen (2019)

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When do I use in-text citations?

When should you add in-text citations in your paper .

There are several rules of thumb you can follow to make sure that you are citing your paper correctly in APA 7 format. 

• Think of your paper broken up into paragraphs. When you start a paragraph, the first time you add a sentence that has been paraphrased from a reference -> that's when you need to add an in-text citation. 
• Continue writing your paragraph, you do NOT need to add another in-text citation until: 1) You are paraphrasing from a NEW source, which means you need to cite NEW information OR 2) You need to cite a DIRECT quote, which includes a page number, paragraph number or Section title. 
• Important to remember : You DO NOT need to add an in-text citation after EVERY sentence of your paragraph. 

What do in-text citations look like?

In-text citation styles: .

Let's look at these examples if they were written in text: 

An example with 1 author:

Parenthetical citation:  Following American Psychological Association (APA) style guidelines will help you to cultivate your own unique academic voice as an expert in your field (Forbes, 2020). 

Narrative citation : Forbes (2020) shared that by following American Psychological Association (APA) guidelines, students would learn to find their own voice as experts in the field of nursing. 

An example with 2 authors: 

Parenthetical citation: Research on the use of progressive muscle relaxation for stress reduction has demonstrated the efficacy of the method (Bennett & Miller, 2019). 

Narrative citation: As shared by Bennett and Miller (2019), research on the use of progressive muscle relaxation for stress reduction has demonstrated the efficacy of the method. 

An example with 3 authors: 

Parenthetical citation: Guided imagery has also been shown to reduce stress, length of hospital stay, and symptoms related to medical and psychological conditions (Jones et al., 2020).

Narrative citation: Jones et al. (2020) shared that guided imagery has also been shown to reduce stress, length of hospital stay, and symptoms related to medical and psychological conditions. 

An example with a group/corporate author: 

Parenthetical citation: Dr. Philip G. Rogers, senior vice president at the American Council on Education, was recently elected as the newest chancellor of the university (East Carolina University, 2020). 

Narrative citation: Recently shared on the East Carolina University (2020) website, Dr. Philip G. Rogers, senior vice president at the American Council on Education, was elected as the newest chancellor. 

Tips on Paraphrasing

Paraphrasing is recreating someone else's ideas into your own words & thoughts, without changing the original meaning (gahan, 2020).  .

Here are some best practices when you are paraphrasing: 

• How do I learn to paraphrase? IF you are thoroughly reading and researching articles or book chapters for a paper, you will start to take notes in your own words . Those notes are the beginning of paraphrased information.
• Read the original information, PUT IT AWAY, then rewrite the ideas in your own words . This is hard to do at first, it takes practice, but this is how you start to paraphrase. 
• It's usually better to paraphrase, than to use too many direct quotes. 
• When you start to paraphrase, cite your source. 
• Make sure not to use language that is TOO close to the original, so that you are not committing plagiarism. 
• Use theasaurus.com to help you come up with like/similar phrases if you are struggling. 
• Paraphrasing (vs. using direct quotes) is important because it shows that YOU ACTUALLY UNDERSTAND the information you are reading. 
• Paraphrasing ALLOWS YOUR VOICE to be prevalent in your writing. 
• The best time to use direct quotes is when you need to give an exact definition, provide specific evidence, or if you need to use the original writer's terminology. 
• BEST PRACTICE PER PARAGRAPH: On your 1st paraphrase of a source, CITE IT. There is no need to add another in-text citation until you use a different source, OR, until you use a direct quote. 

References : 

Gahan, C. (2020, October 15). How to paraphrase sources . Scribbr.com .   https://tinyurl.com/y7ssxc6g  

Citing Direct Quotes

When should i use a direct quote in my paper .

Direct quotes should only be used occasionally: 

• When you need to share an exact definition 
• When you want to provide specific evidence or information that cannot be paraphrased
• When you want to use the original writer's terminology

From:  https://americanlibrariesmagazine.org/whaddyamean/ 

Definitions of direct quotes: 

• Western Oregon University's APA Guidelines on Direct Quotes This is an excellent quick tutorial on how to format direct quotes in APA 7th edition. Bookmark this page for future reference!

Carrie Forbes, MLS

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A citation is a formal reference to a published or unpublished source that you consulted and obtained information from while writing your research paper. It refers to a source of information that supports a factual statement, proposition, argument, or assertion or any quoted text obtained from a book, article, web site, or any other type of material . In-text citations are embedded within the body of your paper and use a shorthand notation style that refers to a complete description of the item at the end of the paper. Materials cited at the end of a paper may be listed under the heading References, Sources, Works Cited, or Bibliography. Rules on how to properly cite a source depends on the writing style manual your professor wants you to use for the class [e.g., APA, MLA, Chicago, Turabian, etc.]. Note that some disciplines have their own citation rules [e.g., law].

Citations: Overview. OASIS Writing Center, Walden University; Research and Citation. The Writing Lab and The OWL. Purdue University; Citing Sources. University Writing Center, Texas A&M University.

Citing Your Sources

Reasons for Citing Sources in Your Research Paper

English scientist, Sir Isaac Newton, once wrote, "If I have seen further, it is by standing on the shoulders of giants.”* Citations support learning how to "see further" through processes of intellectual discovery, critical thinking, and applying a deliberate method of navigating through the scholarly landscape by tracking how cited works are propagated by scholars over time and the subsequent ways this leads to the devarication of new knowledge.

Listed below are specific reasons why citing sources is an important part of doing good research.

• Shows the reader where to find more information . Citations help readers expand their understanding and knowledge about the issues being investigated. One of the most effective strategies for locating authoritative, relevant sources about a research problem is to review materials cited in studies published by other authors. In this way, the sources you cite help the reader identify where to go to examine the topic in more depth and detail.
• Increases your credibility as an author . Citations to the words, ideas, and arguments of scholars demonstrates that you have conducted a thorough review of the literature and, therefore, you are reporting your research results or proposing recommended courses of action from an informed and critically engaged perspective. Your citations offer evidence that you effectively contemplated, evaluated, and synthesized sources of information in relation to your conceptualization of the research problem.
• Illustrates the non-linear and contested nature of knowledge creation . The sources you cite show the reader how you characterized the dynamics of prior knowledge creation relevant to the research problem and how you managed to identify the contested relationships between problems and solutions proposed among scholars. Citations don't just list materials used in your study, they tell a story about how prior knowledge-making emerged from a constant state of creation, renewal, and transformation.
• Reinforces your arguments . Sources cited in your paper provide the evidence that readers need to determine that you properly addressed the “So What?” question. This refers to whether you considered the relevance and significance of the research problem, its implications applied to creating new knowledge, and its importance for improving practice. In this way, citations draw attention to and support the legitimacy and originality of your own ideas and assertions.
• Demonstrates that you "listened" to relevant conversations among scholars before joining in . Your citations tell the reader where you developed an understanding of the debates among scholars. They show how you educated yourself about ongoing conversations taking place within relevant communities of researchers before inserting your own ideas and arguments. In peer-reviewed scholarship, most of these conversations emerge within books, research reports, journal articles, and other cited works.
• Delineates alternative approaches to explaining the research problem . If you disagree with prior research assumptions or you believe that a topic has been understudied or you find that there is a gap in how scholars have understood a problem, your citations serve as the source materials from which to analyze and present an alternative viewpoint or to assert that a different course of action should be pursued. In short, the materials you cite serve as the means by which to argue persuasively against long-standing assumptions promulgated in prior studies.
• Helps the reader understand contextual aspects of your research . Cited sources help readers understand the specific circumstances, conditions, and settings of the problem being investigated and, by extension, how your arguments can be fully understood and assessed. Citations place your line of reasoning within a specific contextualized framework based on how others have studied the problem and how you interpreted their findings in support of your overall research objectives.
• Frames the development of concepts and ideas within the literature . No topic in the social and behavioral sciences rests in isolation from research that has taken place in the past. Your citations help the reader understand the growth and transformation of the theoretical assumptions, key concepts, and systematic inquiries that emerged prior to your engagement with the research problem.
• Underscores sources that were most important to you . Your citations represent a set of choices made about what you determined to be the most important sources for understanding the topic. They not only list what you discovered, but why it matters and how the materials you chose to cite fit within the broader context of your research design and arguments. As part of an overall assessment of the study’s validity and reliability , the choices you make also helps the reader determine what sources of research may have been excluded.
• Provides evidence of interdisciplinary thinking . An important principle of good research is to extend your review of the literature beyond the predominant disciplinary space where scholars have previously examined a topic. Citations provide evidence that you have integrated epistemological arguments, observations, and/or methodological strategies of other disciplines into your paper, thereby demonstrating that you understand the complex, interconnected nature of contemporary research topics.
• Forms the basis for bibliometric analysis of research . Bibliometric analysis is a quantitative method used, for example, to identify and predict emerging trends in research, document patterns of collaboration among scholars, explore the intellectual structure of a specific domain of research, map the development of research within and across disciplines, or identify gaps in knowledge within the literature. Bibliometrics data can also be used to visually map relationships among published studies. An author's citations to books, journal articles, research reports, and other publications represent the raw data used in bibliometric research.
• Supports critical thinking and independent learning . Evaluating the authenticity, reliability, validity, and originality of prior research is an act of interpretation and introspective reasoning applied to assessing whether a source of information will contribute to understanding the problem in ways that are persuasive and align with your overall research objectives. Reviewing and citing prior studies represents a deliberate act of critically scrutinizing each source as part of your overall assessment of how scholars have confronted the research problem.
• Honors the achievements of others . As Susan Blum recently noted,** citations not only identify sources used, they acknowledge the achievements of scholars within the larger network of research about the topic. Citing sources is a normative act of professionalism within academe and a way to highlight and recognize the work of scholars who likely do not obtain any tangible benefits or monetary value from their research endeavors. Your citations help to validate the work of others.

*Vernon. Jamie L. "On the Shoulder of Giants." American Scientist 105 (July-August 2017): 194.

**Blum, Susan D. "In Defense of the Morality of Citation.” Inside Higher Ed , January 29, 2024.

Aksnes, Dag W., Liv Langfeldt, and Paul Wouters. "Citations, Citation Indicators, and Research Quality: An Overview of Basic Concepts and Theories." Sage Open 9 (January-March 2019): https://doi.org/10.1177/2158244019829575; Blum, Susan Debra. My Word!: Plagiarism and College Culture . Ithaca, NY: Cornell University Press, 2009; Bretag, Tracey., editor. Handbook of Academic Integrity . Singapore: Springer Singapore, 2020; Ballenger, Bruce P. The Curious Researcher: A Guide to Writing Research Papers . 7th edition. Boston, MA: Pearson, 2012; D'Angelo, Barbara J. "Using Source Analysis to Promote Critical Thinking." Research Strategies 18 (Winter 2001): 303-309; Donthu, Naveen et al. “How to Conduct a Bibliometric Analysis: An Overview and Guidelines.” Journal of Business Research 133 (2021): 285-296; Mauer, Barry and John Venecek. “Scholarship as Conversation.” Strategies for Conducting Literary Research, University of Central Florida, 2021; Öztürk, Oguzhan, Ridvan Kocaman, and Dominik K. Kanbach. "How to Design Bibliometric Research: An Overview and a Framework Proposal." Review of Managerial Science (2024): 1-29; Why Cite? Poorvu Center for Teaching and Learning, Yale University; Citing Information. The Writing Center. University of North Carolina; Harvard Guide to Using Sources. Harvard College Writing Program. Harvard University; Newton, Philip. "Academic Integrity: A Quantitative Study of Confidence and Understanding in Students at the Start of Their Higher Education."  Assessment and Evaluation in Higher Education 41 (2016): 482-497; Referencing More Effectively. Academic Skills Centre. University of Canberra; Using Sources. Yale College Writing Center. Yale University; Vosburgh, Richard M. "Closing the Academic-practitioner Gap: Research Must Answer the “SO WHAT” Question." H uman Resource Management Review 32 (March 2022): 100633; When and Why to Cite Sources. Information Literacy Playlists, SUNY, Albany Libraries.

Structure and Writing Style

Referencing your sources means systematically showing what information or ideas you acquired from another author’s work, and identifying where that information come from . You must cite research in order to do research, but at the same time, you must delineate what are your original thoughts and ideas and what are the thoughts and ideas of others. Citations help achieve this. Procedures used to cite sources vary among different fields of study. If not outlined in your course syllabus or writing assignment, always speak with your professor about what writing style for citing sources should be used for the class because it is important to fully understand the citation style to be used in your paper, and to apply it consistently. If your professor defers and tells you to "choose whatever you want, just be consistent," then choose the citation style you are most familiar with or that is appropriate to your major [e.g., use Chicago style if you are majoring in history; use APA if its an education course; use MLA if it is literature or a general writing course].

GENERAL GUIDELINES

1. Are there any reasons I should avoid referencing other people's work? No. If placed in the proper context, r eferencing other people's research is never an indication that your work is substandard or lacks originality. In fact, the opposite is true. If you write your paper without adequate references to previous studies, you are signaling to the reader that you are not familiar with the literature on the topic, thereby, undermining the validity of your study and your credibility as a researcher. Including references in academic writing is one of the most important ways to demonstrate your knowledge and understanding of how the research problem has been addressed. It is the intellectual packaging around which you present your thoughts, ideas, and arguments to the reader.

2. What should I do if I find out that my great idea has already been studied by another researcher? It can be frustrating to come up with what you believe is a great topic only to find that it's already been thoroughly studied. However, do not become frustrated by this. You can acknowledge the prior research by writing in the text of your paper [see also Smith, 2002], then citing the complete source in your list of references. Use the discovery of prior studies as an opportunity to demonstrate the significance of the problem being investigated and, if applicable, as a means of delineating your analysis from those of others [e.g., the prior study is ten years old and doesn't take into account new variables]. Strategies for responding to prior research can include: stating how your study updates previous understandings about the topic, offering a new or different perspective, applying a different or innovative method of gathering and interpreting data, and/or describing a new set of insights, guidelines, recommendations, best practices, or working solutions.

3. What should I do if I want to use an adapted version of someone else's work? You still must cite the original work. For example, you use a table of statistics from a journal article published in 1996 by author Smith, but you have altered or added new data to it. Reference the revised chart, such as, [adapted from Smith, 1996], then cite the original source in your list of references. You can also use other terms in order to specify the exact relationship between the original source and the version you have presented, such as, "based on data from Smith [1996]...," or "summarized from Smith [1996]...." Citing the original source helps the reader locate where the information was first presented and under what context it was used as well as to evaluate how effectively you applied it to your own research.

4. What should I do if several authors have published very similar information or ideas? You can indicate that the topic, idea, concept, or information can be found in the works of others by stating something similar to the following example: "Though many scholars have applied rational choice theory to understanding economic relations among nations [Smith, 1989; Jones, 1991; Johnson, 1994; Anderson, 2003; Smith, 2014], little attention has been given to applying the theory to examining the influence of non-governmental organizations in a globalized economy." If you only reference one author or only the most recent study, then your readers may assume that only one author has published on this topic, or more likely, they will conclude that you have not conducted a thorough review of the literature. Referencing all relevant authors of prior studies gives your readers a clear idea of the breadth of analysis you conducted in preparing to study the research problem. If there has been a significant number of prior studies on the topic [i.e., ten or more], describe the most comprehensive and recent works because they will presumably discuss and reference the older studies. However, note in your review of the literature that there has been significant scholarship devoted to the topic so the reader knows that you are aware of the numerous prior studies.

5. What if I find exactly what I want to say in the writing of another researcher? In the social sciences, the rationale in duplicating prior research is generally governed by the passage of time, changing circumstances or conditions, or the emergence of variables that necessitate new investigations . If someone else has recently conducted a thorough investigation of precisely the same research problem that you intend to study, then you likely will have to revise your topic, or at the very least, review this literature to identify something new to say about the problem. However, if it is someone else's particularly succinct expression, but it fits perfectly with what you are trying to say, then you can quote from the author directly, referencing the source. Identifying an author who has made the exact same point that you want to make can be an opportunity to validate, as well as reinforce the significance of, the research problem you are investigating. The key is to build on that idea in new and innovative ways. If you are not sure how to do this, consult with a librarian .

6. Should I cite a source even if it was published long ago? Any source used in writing your paper should be cited, regardless of when it was written. However, in building a case for understanding prior research about your topic, it is generally true that you should focus on citing more recently published studies because they presumably have built upon the research of older studies. When referencing prior studies, use the research problem as your guide when considering what to cite. If a study from forty years ago investigated the same topic, it probably should be examined and considered in your list of references because the research may have been foundational or groundbreaking at the time, even if its findings are no longer relevant to current conditions or reflect current thinking [one way to determine if a study is foundational or groundbreaking is to examine how often it has been cited in recent studies using the "Cited by" feature of Google Scholar ]. However, if an older study only relates to the research problem tangentially or it has not been cited in recent studies, then it may be more appropriate to list it under further readings .

7. Can I cite unusual and non-scholarly sources in my research paper? The majority of the citations in a research paper should be to scholarly [a.k.a., academic; peer-reviewed] studies that rely on an objective and logical analysis of the research problem based on empirical evidence that reliably supports your arguments. However, any type of source can be considered valid if it brings relevant understanding and clarity to the topic. This can include, for example, non-textual elements such as photographs, maps, or illustrations. A source can include materials from special or archival collections, such as, personal papers, manuscripts, business memorandums, the official records of an organization, or digitized collections. Citations can also be to unusual items, such as, an audio recording, a transcript from a television news program, a unique set of data, or a social media post. The challenge is knowing how to cite unusual and non-scholarly sources because they often do not fit within consistent citation rules of books or journal articles. Given this, consult with a librarian if you are unsure how to cite a source.

NOTE:   In any academic writing, you are required to identify which ideas, facts, thoughts, concepts, or declarative statements are yours and which are derived from the research of others. The only exception to this rule is information that is considered to be a commonly known fact [e.g., "George Washington was the first president of the United States"] or a statement that is self-evident [e.g., "Australia is a country in the Global South"]. Appreciate, however, that any "commonly known fact" or self-evidencing statement is culturally constructed and shaped by specific social and aesthetical biases . If you have any doubt about whether or not a fact is considered to be widely understood knowledge, provide a supporting citation, or, ask your professor for clarification about whether the statement should be cited.

Ballenger, Bruce P. The Curious Researcher: A Guide to Writing Research Papers . 7th edition. Boston, MA: Pearson, 2012; Blum, Susan Debra. My Word!: Plagiarism and College Culture . Ithaca, NY: Cornell University Press, 2009; Bretag, Tracey., editor. Handbook of Academic Integrity . Singapore: Springer Singapore, 2020; Carlock, Janine. Developing Information Literacy Skills: A Guide to Finding, Evaluating, and Citing Sources . Ann Arbor, MI: University of Michigan Press, 2020; Harvard Guide to Using Sources. Harvard College Writing Program. Harvard University; How to Cite Other Sources in Your Paper. The Structure, Format, Content, and Style of a Journal-Style Scientific Paper. Department of Biology. Bates College; Lunsford, Andrea A. and Robert Connors; The St. Martin's Handbook . New York: St. Martin's Press, 1989; Mills, Elizabeth Shown. Evidence Explained: Citing History Sources from Artifacts to Cyberspace . 3rd edition. Baltimore, MD: Genealogical Publishing Company, 2015; Research and Citation Resources. The Writing Lab and The OWL. Purdue University; Writing Tutorial Services, Center for Innovative Teaching and Learning. Indiana University; Why Cite? Poorvu Center for Teaching and Learning, Yale Univeraity.

Other Citation Research Guides

The following USC Libraries research guide can help you properly cite sources in your research paper:

• Citation Guide

The following USC Libraries research guide offers basic information on using images and media in research:

Listed below are particularly well-done and comprehensive websites that provide specific examples of how to cite sources under different style guidelines.

• Purdue University Online Writing Lab
• Southern Cross University Harvard Referencing Style
• University of Wisconsin Writing Center

This is a useful guide concerning how to properly cite images in your research paper.

• Colgate Visual Resources Library, Citing Images

This guide provides good information on the act of citation analysis, whereby you count the number of times a published work is cited by other works in order to measure the impact of a publication or author.

Measuring Your Impact: Impact Factor, Citation Analysis, and other Metrics: Citation Analysis [Sandy De Groote, University of Illinois, Chicago]

Automatic Citation Generators

The links below lead to systems where you can type in your information and have a citation compiled for you. Note that these systems are not foolproof so it is important that you verify that the citation is correct and check your spelling, capitalization, etc. However, they can be useful in creating basic types of citations, particularly for online sources.

• BibMe -- APA, MLA, Chicago, and Turabian styles
• DocsCite -- for citing government publications in APA or MLA formats
• EasyBib -- APA, MLA, and Chicago styles
• Son of Citation Machine -- APA, MLA, Chicago, and Turabian styles

NOTE:   Many companies that create the research databases the USC Libraries subscribe to, such as ProQuest , include built-in citation generators that help take the guesswork out of how to properly cite a work. When available, you should always utilize these features because they not only generate a citation to the source [e.g., a journal article], but include information about where you accessed the source [e.g., the database].

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• Last Updated: Jun 17, 2024 9:29 AM
• URL: https://libguides.usc.edu/writingguide

In-Text Citations

In scholarly writing, it is essential to acknowledge how others contributed to your work. By following the principles of proper citation, writers ensure that readers understand their contribution in the context of the existing literature—how they are building on, critically examining, or otherwise engaging the work that has come before.

APA Style provides guidelines to help writers determine the appropriate level of citation and how to avoid plagiarism and self-plagiarism.

We also provide specific guidance for in-text citation, including formats for interviews, classroom and intranet sources, and personal communications; in-text citations in general; and paraphrases and direct quotations.

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Instructional Aids

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Citing Sources

Mla end-of-text citations.

Overall Format Works Cited

• Title:  In MLA style, all the sources you cite throughout the text of your paper are listed together at the end, in a section titled  Works Cited .

When citing an essay, you include information in two places: in the body of your paper and in the Works Cited that comes after it. The Works Cited is just a bibliography: you list all the sources you used to write the paper.

• Alphabetical order: Starting on the next line after the Works Cited title, list your references in alphabetical order by author’s last name. Multiple sources by the same author should be listed chronologically by year within the same group.
• Hanging indents: Each reference should be formatted with what is called a hanging indent. This means the first line of each reference should be flush with the left margin (i.e., not indented), but the other lines of that reference should be indented 0.5 inches. Any word-processing program will let you format this automatically so you don’t have to do it by hand. (In Microsoft Word, for example, you simply highlight your citations, click on the small arrow right next to the word “Paragraph” on the home tab, and in the popup box choose “hanging indent” under the “Special” section. Click OK, and you’re done.)

Formats for Different Types of Sources in the Works Cited List

Regardless of the source type, you need certain “core elements” from your sources placed in a standard order in order to create citations. These core elements are explained in detail below. Note that you do not need to memorize this process, but should take this opportunity to understand how citations are created. You can always return to this page, to the MLA handbook, the MLA Style Center , or to other online resources to help you create the citations you need for your paper.

Click through the following slides to learn more about each component and to see examples of MLA end-of-text citations. Although MLA now uses a 9th edition, this information is still useful, since there are only a few minor changes between 8th and 9th editions.

You can also download the presentation here .

The following videos explain MLA 9th edition format for your citation entries in the Works Cited list at the end of your essay.

Link to the following sites for additional information on MLA formatting style for the whole research paper, and to see sample research essays in MLA format.

• State University of New York, Empire State College’s page on Citing Your Sources: MLA
• Seneca College’s MLA Citation Guide
• MLA End-of-Text Citations. Revision and adaptation of the page MLA Works Cited at https://courses.lumenlearning.com/wm-englishcomposition1/chapter/text-mla-works-cited/ which is a revision and adaptation of sources listed below. Authored by : Susan Oaks. Provided by : Empire State College, SUNY OER Services. Project : College Writing. License : CC BY-NC-SA: Attribution-NonCommercial-ShareAlike
• MLA Works Cited. Provided by : Lumen Learning. Located at : https://courses.lumenlearning.com/wm-englishcomposition1/chapter/text-mla-works-cited/ . Project : English Composition I. License : CC BY-NC-SA: Attribution-NonCommercial-ShareAlike
• video Creating a Works Cited in MLA 9th edition. Authored by : Deanna Parker. Provided by : Southern New Hampshire University. Located at : https://www.youtube.com/watch?v=xo7bSt0DBzY . License : Other . License Terms : standard YouTube License
• MLA Format (8th Ed.) content for slides. Provided by : EasyBib. Located at : http://www.easybib.com/guides/citation-guides/mla-8/ . License : CC BY-NC-SA: Attribution-NonCommercial-ShareAlike
• video MLA Citation Style: Works Cited Page. Provided by : Greenley Library, SUNY Farmingdale State College. Located at : https://www.youtube.com/watch?v=Fb5IVqEJBqk . License : Other . License Terms : standard YouTube license

Stack Exchange Network

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How to add citation for a whole paragraph?

If I write a report and a whole paragraph is based on one source but not cited verbally it seems unnecessary to include the reference after every sentence:

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua (source 1) . Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat (source 1) .

Now I found a Phd thesis that puts the reference after the last dot of the paragraph to indicate that it is based on this very source:

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. (source 1)

Is this a common practice? Is it generally understood? What are other ways to add the reference for a whole paragraph?

• 3 "Recall the following results from Cicero's De finibus bonorum et malorum (source 1):" –  JeffE Commented Mar 22, 2013 at 18:22
• If you use the content of (source 1), you can say The following paragraph is mainly based on (source 1): –  user4511 Commented Mar 23, 2013 at 5:45
• 2 In LaTeX, just wrap the quote inside \begin{quote}...\end{quote} –  user2768 Commented Dec 14, 2017 at 10:38
• 1 Possible duplicate of What kind of citation is needed for a whole paragraph? –  padawan Commented May 23, 2018 at 14:04

6 Answers 6

Generally it is sufficient to cite each source only once in each place where you refer to material from this source. "Place" may be one sentence, one paragraph, one definition, etc.

If you cite a paragraph verbatim from another source, put it in quotation marks or in a quotation block and add one reference to the source at the end.

If you have a whole paragraph referring to one source but don't actually quote it, it gets a little bit more tricky. You have to make sure that a reader clearly understands that the whole paragraph is based on the source you are citing. A simple citation in parenthesis just added at the end of the last sentence may not be sufficient to make this clear. One way to cite in this case is to write something like "The following argument is based on (source)" at the beginning of the paragraph in question.

This problem is one that I commonly come across. In some disciplines one puts a reference after the last sentence in the paragraph, after the final period. I personally do not like this way of doing it and it may not even be formally correct in most disciplines. Instead I would suggest that you start the paragraph (or paragraphs if appropriate) by simply stating where the material has been sourced in the first sentence of the pragraph(s). Exactly how you formulate this depends highly on the content and what you need to write. It can be something dry such as "The following information is from XXX (1979)" but you can probably see how you can weave in the reference in an introductory sentence or two so that it makes sense and clear that you extracted the information from there.

The main point is of course to make it clear to the reader where the information comes from. Clarily will be more important than nice formulations in this case.

This happens to me often. I have several tips that I use when writing:

• the placement: it should not be in a section / chapter explaining your work, algorithm, method, findings . Probably, it'll be in Discussion, Related works, Introduction or Conclusion
• if it deserves a whole paragraph, it deserves a sentence. Some examples:

The proposed method can be compared to the work of [John Doe, 2006]. The work in [1] addresses the problem (...) while the method proposed here (...) In this chapter we introduce a related problem examined in [1]. The first important step in this direction was made by Doe [1] and here we summarize the most important findings.

in general, you are putting some reference in relation to your work. Be precise with expressions referring to each paper like the work proposed here , or the previous results and similar.

if you have more than 1 reference to compare with, introduce them one by one , paragraphy by paragraph.. If you mix them, you'll have to cite every sentence or two to avoid the confusion

you don't have to cite at the end of each sentence, you can cite at the end of each idea . If you're making a logical conclusion and just add a cite with the concluding sentence, you're giving proper credit.

One common approach is to include the citation in the first sentence, and then use "they" and related words for every subsequent sentence so that the connection between statements and reference is clear.

Smith and Jones (2000) conducted a study on X and Y. They performed X analysis. They found that blah blah blah. They concluded that foo foo foo. Their studies highlight that blah blah blah.

The clearest way to show that the entire paragraph is taken from someone else is to set that paragraph off in some way. The two most common ways are to indent the entire paragraph or set the entire paragraph in italics (or both).

The writing should make it clear that the author is not claiming any part of the paragraph as his/her own work and the example in your question simply does NOT accomplish that. The sample could mean that the last sentence is cited and the rest is not, meaning the author is claiming the first sentence is actually his/her own.

It is quite messy to cite each sentence individually and it does not help readability so, better to indent/italicize the entire paragraph.

• 1 Sorry, I didn't refer to cite verbally but to write a paragraph reflecting the knowledge taken from only one source. I updated my question to clarify –  Stockfisch Commented Mar 22, 2013 at 15:06
• 5 I do not agree with putting it in italic or indenting it. That would be fine, in my opinion, if it was taken word for word from somebody else. But, the way I understand it it's just a paragraph based on the paper [Source 1]. –  penelope Commented Mar 23, 2013 at 12:48

The problem doesn't seem to me to be one of how to format a citation for a full paragraph. Instead, the problem is that you have a lengthy paragraph that draws upon one source for many assertions (claims or statements something is/is not so) or facts. This starts to approach a plagiaristic form of writing.

Another problem is that you are basing your entire paragraph on a sole source, and trusting that it is right (or, maybe, the writer simply doesn't care - I see that a lot with the writing of students who just want to get an assignment cranked out). If you are writing a thesis or dissertation, the care and concern for veracity of the information should, I hope, be greater.

Try including more of your own thoughts, reasoning, or explanatory writing. If the paragraph introduces explanatory statements or other work by you, then breaking up the flow with the appropriate in-text citation from the single source isn't an issue, as it is less frequent than once every sentence. Or, find other sources that support or amplify the material in the paragraph, add in the necessary associated verbiage, and cite them too.

• What if I have a paragraph in e.g. a background section, where I'm summarising an earlier work that is a primary inspiration for my own work that the reader may not already understand, but is essential to understanding the rest of the paper? –  starbeamrainbowlabs Commented May 26, 2022 at 16:58

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The End of the Korean War: a Historical Perspective

This essay about the end of the Korean War highlights how the conflict concluded with an armistice on July 27, 1953, rather than a formal peace treaty. It explores the establishment of the Korean Demilitarized Zone (DMZ) and the enduring socio-economic impacts on North and South Korea. Despite halting active hostilities, the armistice left the peninsula divided and efforts to achieve a permanent peace treaty have remained elusive. The essay underscores the geopolitical implications of the war’s unresolved status, including the presence of U.S. troops in South Korea and ongoing tensions among regional powers. Overall, it emphasizes the lasting legacy of the Korean War’s end, shaping the complex dynamics of Northeast Asia to this day.

How it works

The Korean War, often overlooked in the shadow of World War II and the Vietnam War, concluded in an armistice rather than a formal peace treaty. The conflict, which began on June 25, 1950, when North Korean forces invaded South Korea, lasted for three years, until July 27, 1953. This marked the cessation of active hostilities, although the war technically persists today due to the absence of a peace agreement.

The war’s end came through the signing of the Korean Armistice Agreement, negotiated by the United Nations Command, North Korea, and China.

The agreement aimed to establish a demilitarized zone (DMZ) along the 38th parallel, which divided the Korean Peninsula. It effectively halted the fighting and established a framework for the withdrawal of foreign troops and prisoners of war exchanges. The armistice was intended as a temporary measure until a peaceful settlement could be reached, but efforts to achieve a permanent peace have since been largely unsuccessful.

One significant outcome of the Korean War’s conclusion was the establishment of the Korean Demilitarized Zone. This 2.5-mile-wide buffer zone spans the entire 155-mile length of the Korean Peninsula, acting as a barrier between North and South Korea. The DMZ, despite its name, is one of the most heavily militarized borders in the world and serves as a poignant reminder of the unresolved state of the conflict.

The legacy of the Korean War endures not only in its physical and political ramifications but also in its socio-economic impacts on the Korean Peninsula. South Korea emerged from the war as a rapidly industrializing nation, buoyed by significant economic aid from the United States and other allies. In contrast, North Korea faced the challenge of rebuilding its economy amidst political isolation and sanctions. The war’s conclusion thus set the stage for divergent paths of development between the two Koreas, shaping their respective destinies for decades to come.

Beyond its immediate implications, the Korean War’s unresolved status continues to influence geopolitics in Northeast Asia. The presence of U.S. troops in South Korea remains a contentious issue, viewed differently by North Korea, South Korea, and neighboring countries such as China and Japan. Efforts to replace the armistice with a peace treaty have been sporadic and complex, reflecting deep-seated political distrust and security concerns among all parties involved.

In conclusion, the end of the Korean War in 1953 marked a pivotal moment in modern history, halting active combat while leaving behind a legacy of division and unresolved tensions on the Korean Peninsula. The armistice agreement, though successful in ending hostilities, failed to achieve a lasting peace, resulting in a fragile status quo that persists to this day. As the Korean Peninsula continues to navigate its complex geopolitical landscape, the lessons of the Korean War’s end serve as a stark reminder of the enduring challenges and aspirations for peace in the region.

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The state of AI in 2023: Generative AI’s breakout year

You have reached a page with older survey data. please see our 2024 survey results here ..

The latest annual McKinsey Global Survey  on the current state of AI confirms the explosive growth of generative AI (gen AI) tools . Less than a year after many of these tools debuted, one-third of our survey respondents say their organizations are using gen AI regularly in at least one business function. Amid recent advances, AI has risen from a topic relegated to tech employees to a focus of company leaders: nearly one-quarter of surveyed C-suite executives say they are personally using gen AI tools for work, and more than one-quarter of respondents from companies using AI say gen AI is already on their boards’ agendas. What’s more, 40 percent of respondents say their organizations will increase their investment in AI overall because of advances in gen AI. The findings show that these are still early days for managing gen AI–related risks, with less than half of respondents saying their organizations are mitigating even the risk they consider most relevant: inaccuracy.

The organizations that have already embedded AI capabilities have been the first to explore gen AI’s potential, and those seeing the most value from more traditional AI capabilities—a group we call AI high performers—are already outpacing others in their adoption of gen AI tools. 1 We define AI high performers as organizations that, according to respondents, attribute at least 20 percent of their EBIT to AI adoption.

The expected business disruption from gen AI is significant, and respondents predict meaningful changes to their workforces. They anticipate workforce cuts in certain areas and large reskilling efforts to address shifting talent needs. Yet while the use of gen AI might spur the adoption of other AI tools, we see few meaningful increases in organizations’ adoption of these technologies. The percent of organizations adopting any AI tools has held steady since 2022, and adoption remains concentrated within a small number of business functions.

Table of Contents

• It’s early days still, but use of gen AI is already widespread
• Leading companies are already ahead with gen AI
• AI-related talent needs shift, and AI’s workforce effects are expected to be substantial
• With all eyes on gen AI, AI adoption and impact remain steady

About the research

1. it’s early days still, but use of gen ai is already widespread.

The findings from the survey—which was in the field in mid-April 2023—show that, despite gen AI’s nascent public availability, experimentation with the tools  is already relatively common, and respondents expect the new capabilities to transform their industries. Gen AI has captured interest across the business population: individuals across regions, industries, and seniority levels are using gen AI for work and outside of work. Seventy-nine percent of all respondents say they’ve had at least some exposure to gen AI, either for work or outside of work, and 22 percent say they are regularly using it in their own work. While reported use is quite similar across seniority levels, it is highest among respondents working in the technology sector and those in North America.

Organizations, too, are now commonly using gen AI. One-third of all respondents say their organizations are already regularly using generative AI in at least one function—meaning that 60 percent of organizations with reported AI adoption are using gen AI. What’s more, 40 percent of those reporting AI adoption at their organizations say their companies expect to invest more in AI overall thanks to generative AI, and 28 percent say generative AI use is already on their board’s agenda. The most commonly reported business functions using these newer tools are the same as those in which AI use is most common overall: marketing and sales, product and service development, and service operations, such as customer care and back-office support. This suggests that organizations are pursuing these new tools where the most value is. In our previous research , these three areas, along with software engineering, showed the potential to deliver about 75 percent of the total annual value from generative AI use cases.

In these early days, expectations for gen AI’s impact are high : three-quarters of all respondents expect gen AI to cause significant or disruptive change in the nature of their industry’s competition in the next three years. Survey respondents working in the technology and financial-services industries are the most likely to expect disruptive change from gen AI. Our previous research shows  that, while all industries are indeed likely to see some degree of disruption, the level of impact is likely to vary. 2 “ The economic potential of generative AI: The next productivity frontier ,” McKinsey, June 14, 2023. Industries relying most heavily on knowledge work are likely to see more disruption—and potentially reap more value. While our estimates suggest that tech companies, unsurprisingly, are poised to see the highest impact from gen AI—adding value equivalent to as much as 9 percent of global industry revenue—knowledge-based industries such as banking (up to 5 percent), pharmaceuticals and medical products (also up to 5 percent), and education (up to 4 percent) could experience significant effects as well. By contrast, manufacturing-based industries, such as aerospace, automotives, and advanced electronics, could experience less disruptive effects. This stands in contrast to the impact of previous technology waves that affected manufacturing the most and is due to gen AI’s strengths in language-based activities, as opposed to those requiring physical labor.

Responses show many organizations not yet addressing potential risks from gen AI

According to the survey, few companies seem fully prepared for the widespread use of gen AI—or the business risks these tools may bring. Just 21 percent of respondents reporting AI adoption say their organizations have established policies governing employees’ use of gen AI technologies in their work. And when we asked specifically about the risks of adopting gen AI, few respondents say their companies are mitigating the most commonly cited risk with gen AI: inaccuracy. Respondents cite inaccuracy more frequently than both cybersecurity and regulatory compliance, which were the most common risks from AI overall in previous surveys. Just 32 percent say they’re mitigating inaccuracy, a smaller percentage than the 38 percent who say they mitigate cybersecurity risks. Interestingly, this figure is significantly lower than the percentage of respondents who reported mitigating AI-related cybersecurity last year (51 percent). Overall, much as we’ve seen in previous years, most respondents say their organizations are not addressing AI-related risks.

2. Leading companies are already ahead with gen AI

The survey results show that AI high performers—that is, organizations where respondents say at least 20 percent of EBIT in 2022 was attributable to AI use—are going all in on artificial intelligence, both with gen AI and more traditional AI capabilities. These organizations that achieve significant value from AI are already using gen AI in more business functions than other organizations do, especially in product and service development and risk and supply chain management. When looking at all AI capabilities—including more traditional machine learning capabilities, robotic process automation, and chatbots—AI high performers also are much more likely than others to use AI in product and service development, for uses such as product-development-cycle optimization, adding new features to existing products, and creating new AI-based products. These organizations also are using AI more often than other organizations in risk modeling and for uses within HR such as performance management and organization design and workforce deployment optimization.

AI high performers are much more likely than others to use AI in product and service development.

Another difference from their peers: high performers’ gen AI efforts are less oriented toward cost reduction, which is a top priority at other organizations. Respondents from AI high performers are twice as likely as others to say their organizations’ top objective for gen AI is to create entirely new businesses or sources of revenue—and they’re most likely to cite the increase in the value of existing offerings through new AI-based features.

As we’ve seen in previous years , these high-performing organizations invest much more than others in AI: respondents from AI high performers are more than five times more likely than others to say they spend more than 20 percent of their digital budgets on AI. They also use AI capabilities more broadly throughout the organization. Respondents from high performers are much more likely than others to say that their organizations have adopted AI in four or more business functions and that they have embedded a higher number of AI capabilities. For example, respondents from high performers more often report embedding knowledge graphs in at least one product or business function process, in addition to gen AI and related natural-language capabilities.

While AI high performers are not immune to the challenges of capturing value from AI, the results suggest that the difficulties they face reflect their relative AI maturity, while others struggle with the more foundational, strategic elements of AI adoption. Respondents at AI high performers most often point to models and tools, such as monitoring model performance in production and retraining models as needed over time, as their top challenge. By comparison, other respondents cite strategy issues, such as setting a clearly defined AI vision that is linked with business value or finding sufficient resources.

The findings offer further evidence that even high performers haven’t mastered best practices regarding AI adoption, such as machine-learning-operations (MLOps) approaches, though they are much more likely than others to do so. For example, just 35 percent of respondents at AI high performers report that where possible, their organizations assemble existing components, rather than reinvent them, but that’s a much larger share than the 19 percent of respondents from other organizations who report that practice.

Many specialized MLOps technologies and practices  may be needed to adopt some of the more transformative uses cases that gen AI applications can deliver—and do so as safely as possible. Live-model operations is one such area, where monitoring systems and setting up instant alerts to enable rapid issue resolution can keep gen AI systems in check. High performers stand out in this respect but have room to grow: one-quarter of respondents from these organizations say their entire system is monitored and equipped with instant alerts, compared with just 12 percent of other respondents.

3. AI-related talent needs shift, and AI’s workforce effects are expected to be substantial

Our latest survey results show changes in the roles that organizations are filling to support their AI ambitions. In the past year, organizations using AI most often hired data engineers, machine learning engineers, and Al data scientists—all roles that respondents commonly reported hiring in the previous survey. But a much smaller share of respondents report hiring AI-related-software engineers—the most-hired role last year—than in the previous survey (28 percent in the latest survey, down from 39 percent). Roles in prompt engineering have recently emerged, as the need for that skill set rises alongside gen AI adoption, with 7 percent of respondents whose organizations have adopted AI reporting those hires in the past year.

The findings suggest that hiring for AI-related roles remains a challenge but has become somewhat easier over the past year, which could reflect the spate of layoffs at technology companies from late 2022 through the first half of 2023. Smaller shares of respondents than in the previous survey report difficulty hiring for roles such as AI data scientists, data engineers, and data-visualization specialists, though responses suggest that hiring machine learning engineers and AI product owners remains as much of a challenge as in the previous year.

Looking ahead to the next three years, respondents predict that the adoption of AI will reshape many roles in the workforce. Generally, they expect more employees to be reskilled than to be separated. Nearly four in ten respondents reporting AI adoption expect more than 20 percent of their companies’ workforces will be reskilled, whereas 8 percent of respondents say the size of their workforces will decrease by more than 20 percent.

Looking specifically at gen AI’s predicted impact, service operations is the only function in which most respondents expect to see a decrease in workforce size at their organizations. This finding generally aligns with what our recent research  suggests: while the emergence of gen AI increased our estimate of the percentage of worker activities that could be automated (60 to 70 percent, up from 50 percent), this doesn’t necessarily translate into the automation of an entire role.

AI high performers are expected to conduct much higher levels of reskilling than other companies are. Respondents at these organizations are over three times more likely than others to say their organizations will reskill more than 30 percent of their workforces over the next three years as a result of AI adoption.

4. With all eyes on gen AI, AI adoption and impact remain steady

While the use of gen AI tools is spreading rapidly, the survey data doesn’t show that these newer tools are propelling organizations’ overall AI adoption. The share of organizations that have adopted AI overall remains steady, at least for the moment, with 55 percent of respondents reporting that their organizations have adopted AI. Less than a third of respondents continue to say that their organizations have adopted AI in more than one business function, suggesting that AI use remains limited in scope. Product and service development and service operations continue to be the two business functions in which respondents most often report AI adoption, as was true in the previous four surveys. And overall, just 23 percent of respondents say at least 5 percent of their organizations’ EBIT last year was attributable to their use of AI—essentially flat with the previous survey—suggesting there is much more room to capture value.

Organizations continue to see returns in the business areas in which they are using AI, and they plan to increase investment in the years ahead. We see a majority of respondents reporting AI-related revenue increases within each business function using AI. And looking ahead, more than two-thirds expect their organizations to increase their AI investment over the next three years.

The online survey was in the field April 11 to 21, 2023, and garnered responses from 1,684 participants representing the full range of regions, industries, company sizes, functional specialties, and tenures. Of those respondents, 913 said their organizations had adopted AI in at least one function and were asked questions about their organizations’ AI use. To adjust for differences in response rates, the data are weighted by the contribution of each respondent’s nation to global GDP.

The survey content and analysis were developed by Michael Chui , a partner at the McKinsey Global Institute and a partner in McKinsey’s Bay Area office, where Lareina Yee is a senior partner; Bryce Hall , an associate partner in the Washington, DC, office; and senior partners Alex Singla and Alexander Sukharevsky , global leaders of QuantumBlack, AI by McKinsey, based in the Chicago and London offices, respectively.

They wish to thank Shivani Gupta, Abhisek Jena, Begum Ortaoglu, Barr Seitz, and Li Zhang for their contributions to this work.

This article was edited by Heather Hanselman, an editor in the Atlanta office.

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