Publication Manual of the American Psychological Association by
Publication Date: 2010-01-01
The Publication Manual of the American Psychological Association is the style manual of choice for writers, editors, students, and educators in the social and behavioural sciences. [publisher]
The Purdue OWL APA page
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