There are many good resources to help you use APA 6th style. The best and easiest to use is from the Purdue Online Writing Center.
You can also view resources available the Georgia Tech Library.
There are many citation guides, handbooks and style manuals in the GT Library.
Concise rules of APA style 6th Edition/American Psychological Association (print)
Lastly, you can go to the American Psychological Association (APA) website.