The most frequently used citation styles are listed below. If no guide is listed for your discipline, check with your instructor to see which style you should use. Whatever style you choose, be sure to use it consistently within a document - do not mix styles within one document.
For a general discussion of citation styles, see:
MLA is used most often in language and literature classes and other disciplines in the humanities.
MLA Handbook for Writers of Research Papers
Chicago style is used a wide range of disciplines in the social sciences and humanities.
The Chicago Manual of Style: Ready Reference (@ Circulation Desk) Z253 .U69 2010
APA style is very often used in the social sciences and business.
Turabian style is a version of Chicago style created for students writing research papers.