Linguistics and Language: A Research Guide: Citation and Style Manuals

The 17th Edition is available in book form and online.
For answers to some of the basic questions about Chicago Style, see Citation Style Quickguide

The 8th edition of the MLA Handbook guides writers through the principles behind evaluating sources for their research. It then shows them how to cite sources in their writing and create useful entries for the works-cited list. More than just a new edition, this is a new MLA style.

The MLA Style Center, online, also provides some guidance in the Works Cited: Quick Guide and in a list of FAQs in Ask the MLA.

Finally, the Purdue OWL for MLA site offers an excellent online guide for MLA Citation Style. If you don't find your answer there, you may need to check the print copy, shelved behind the Reference Desk in Olin Library

7th edition. "The Publication Manual of the American Psychological Association is the style manual of choice for writers, editors, students, and educators in the social and behavioral sciences." [publisher]

The Purdue OWL APA site offers an excellent online guide for APA Citation Style. If you don't find your answer there, you may need to check the print copy, shelved behind the Reference Desk in Olin Library
See also: APA Blog.