There are many books about using the APA Style at Rutgers Libraries; some are reference books, and some may be checked out. Here is a partial list of those available at Alexander Library.
If you would like to pick up a handy reference, I like this one because it is easy to carry with you: The APA Style of Documentation: A Pocket Guide
A similar title at RUL is available in reference at the Library of Science and Medicine: Pocket Guide to APA Style
The MLIS program requires that citations follow APA (American Psychological Association) Style. Here are some resources to help: