Publication Manual of the American Psychological Association: The Official Guide to APA Style
Call Number: Olin Reference BF 76.7 .P83 2020; shelved behind the reference desk
Publication Date: 2020
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.