Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

Citing Sources: Citations Home

A guide to citing sources in MLA, APA, and Chicago format.

Citation Styles

Citation styles define how citations or references are organized and formatted within a paper.  The three most commonly used citation styles in higher education include:  

  • Modern Language Association (MLA) Format - used in literature, arts, humanities, and some other disciplines.
  • American Psychological Association (APA) Format - used in social sciences such as anthropology, business, psychology, sociology, and political science.
  • Chicago Format - also known as Turabian format, and used most often in history and art.

If you are not sure which one to use, ask your instructor what citation style he or she prefers you to use for your assignments.

FREE Writing Tutors

Need a little extra help with your studies? Pima Community College offers free tutoring at all its Learning/Tutoring Centers.

How and Why you should Cite a Source

Used with permission of the University Library, University of Illinois at Urbana-Champaign.

Plagiarism - how to avoid it

What is Plagiarism?

Used with permission from the Paul Robeson Library, Reference Department, Rutgers University.

Research Help

There are lots of ways to get more help:



E-mail us at Ask a librarian


Give us a call: 520-206-4370


Reference Desk
Come by the reference desk at any PCC campus library for a one-on-one consultation.