Using American Psychological Association (APA) Format A lengthy guide with examples, from the Purdue University Online Writing Lab.
Using Modern Language Association (MLA) 2009 Format A lengthy guide with examples, from the Purdue University Online Writing Lab.
Using American Sociological Association (ASA) Format A guide with examples from California State University, Los Angeles.
Chicago Manual of Style
Cite Right An e-guidebook to many citation styles, including MLA, APA, AMA, CSE, AAA and Bluebook legal citations.
Citing Government Documents Offers detailed examples for APA, Chicago, MLA and Turabian styles.
How to Cite Data A guide with examples for citing research datasets and statistical tables.