CSUF APA Style Guide: (Sixth Edition) Downloadable two-page overview of common citation needs.
Purdue OWL: Easy-to-use citation resource. Provides rules and examples.
Official FAQs of APA: Helps clarify confusing questions on a variety of topics.
APA Official Website: Website of the American Psychological Association style manual.
Purdue OWL APA In-Text Basics: Covers basics of in-text citation rules and more.
Purdue OWL APA Reference List Basics: Covers basics of reference list rules and more.
Additional Citation Examples:
Northern Michigan University APA Reference Style Guide: Contains a lot of useful examples.