Rules #27-30 (p.204-205) all apply to reference materials. These are in Section 7.02 for Books, Reference Books, and Book Chapters. The examples vary depending on whether the reference book is print or online-based, so choose the rule according to the source you are using.
|All information and page number references are based on the 6th edition of the Publication Manual of the American Psychological Association (2009/10).|
Need a copy of the Publication Manual? Click here for details. See Also: APA Style Guide to Electronic References, Sixth Edition