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Citing Your Sources

This guide is intended to help you cite sources, avoid plagiarism, learn about citation styles and available citation tools, and more.

What Style Should I Use?


There are many different citation styles that continue to evolve as technology and varieties of resources increase. Generally, a citation style is established by a ruling body, typically one of a specific profession or subject area, and provides rules and conventions that best fit the types of sources used by that profession/ subject area.

While in school, you should use the style required by your assignment or professor.

APA Style

APA Style, currently in its 7th edition This link opens in a new window, is a citation protocol established by the American Psychological Association. This style was developed to ensure consistency and to provide style rules for scientific writing. 

APA is most often used in the disciplines of:

  • Social Sciences (including Psychology, Education, Sociology, Economics, Criminal Justice, etc.)
  • Business
  • Nursing

What does APA Style include?

  • the format & structure of your paper
  • how you cite other authors within the body of your paper
  • how you compile a references page at the end of your paper

MLA Style

MLA Style, currently in its 8th edition This link opens in a new window, is a citation protocol established by the Modern Language Association. This style was developed for students to support the writing process.

MLA is most often used in the Humanities disciplines including, but not limited to:

  • English Language & Literature
  • Comparative Literature
  • Cultural Studies
  • Foreign Languages
  • Other areas in the humanities

What does MLA Style include?

  • the format & page layout of your paper
  • stylistic technicalities (e.g. abbreviations, footnotes, quotations)
  • how you cite other authors within the body of your paper
  • how you compile a references page at the end of your paper

Chicago Style

Chicago Style, currently in its 17th edition This link opens in a new window, is a citation protocol established by the University of Chicago. 

Chicago Style is most often used in the disciplines of:

  • History
  • Religion

What does Chicago Style include?

  • instruction for manuscript preparation and publication
  • guidelines for style, grammar and usage
  • rules for documenting your sources in-text including the Notes-Bibliography System (NB) and the Author-Date System
  • guidelines for a Bibliography at the end of your paper

Other Styles

First, it's important that you use the citation style required by your assignment or professor (your syllabus or assignment guidelines/description should list the required citation style but if not, ask your professor).

If you are permitted to choose a citation style to use, it may be easiest to choose one of the most common citation styles (APA, MLA, Chicago).

You may also want to choose a citation style based on the field of study you are working in. Here is a brief list of some major disciplines and the citation styles most commonly associated with them:

Citation Styles
CITATION STYLE FIELD OF STUDY OR PROFESSION
AAA (American Anthropological Association) This link opens in a new window
Full access pdf - free
Anthropology
ACS (American Chemical Society) This link opens in a new window
Information about guide - no free access
Chemistry
AIP ( American Institute of Physics) This link opens in a new window
Preparing your manuscript guide
Physics
ALWD (Association of Legal Writing Directors) and Blue Book This link opens in a new window
Information about guide - no free access

Introduction to Basic Legal Citation (online ed. 2020) by Peter W. Martin This link opens in a new window
Free access to basic legal citation information website from Cornell University Law School
Legal Studies
AMA (American Medical Association) This link opens in a new window Medical Sciences
AMS (American Mathematical Society) This link opens in a new window
Full access pdf - free
Mathematics
AP (Associated Press) This link opens in a new window
Information about guide - no free access
Journalism
Public Relations
APA (American Psychological Association) This link opens in a new window
Information about guide - no free access

APA Guide Purdue OWL This link opens in a new window
Full access website - free
Business
Criminology
Economics
Education
Psychology
Social Sciences
Sociology

APSA (American Political Science Association) This link opens in a new window
Full access pdf - free

International Studies
Political Science
ASA (American Sociological Association) This link opens in a new window
Information about guide - no free access

ASA Guide Purdue OWL This link opens in a new window
Full access website - free
Sociology
Chicago Manual of Style This link opens in a new window
Quick guide access - free (not full manual)

Chicago Manual of Style Purdue OWL This link opens in a new window
Full access website - free
Humanities
History
Religion
Social Sciences
CSE (Council of Science Editors) This link opens in a new window
Information about guide - no free access

CSE Guide by U of Wisconsin Writing Center This link opens in a new window
Full access website - free
Biology
Harvard Business School This link opens in a new window
Full access pdf - free
Business
LSA Style Sheet This link opens in a new window
Full access pdf - free
Linguistics
Maroonbook (The University of Chicago Manual of Legal Citation) This link opens in a new window
Full access pdf - free
Legal Studies
MLA (Modern Language Association) This link opens in a new window
Information about guide - no free access
 
Humanities
Literature
NLM (National Library of Medicine) This link opens in a new window
Full access website and pdf - free
Medical Publications
Turabian This link opens in a new window
Quick guide access - free (not full manual)
Humanities
Natural Sciences
Social Sciences

A larger listing of disciplines and citation styles can be accessed on OWL at Purdue website This link opens in a new window.