The Publication Manual
The best resource to consult is the Publication Manual itself. The APA gives us the following description, "
The Concise Rules of APA Style
The second resource to turn to may be the Concise Rules of APA style. It is not so in depth but provides all of the rules of the APA. Here is how WorldCat describes the book. "
The APA Style Web Page
The APA style website has a lot of great resources such as online tutorials, charts and corrections. The web page is separated into 3 sections. One section describes the Manual itself, another section has quite a few helpful learning tools and online tutorials and the third section provides information on products that can be purchased. Here is a link to a free tutorial on, "what's new in the 6th edition".
The APA Style Blog
One of the resources that is linked to from the APA style web page is the blog. This blog has really useful, interesting posts about things like how to cite Facebook to how to create a 3 em dash on a mac or "What belongs in the reference list". You may be able to answer many of your questions by searching or following this blog.
APA Style on Facebook and Twitter
Like everything else these days, APA Style is on Facebook and Twitter. These updates are actually helpful though to keep abreast of changes in formatting, answers to crucial questions like how to find a DOI number or how to cite a phone interview. Below is a screen shot of the late APA Style tweets!
The OWL at Purdue
In all honesty The OWL at Purdue is my first stop for formatting and citing questions involving APA and MLA style. It is authoritative because it is edited by librarians and writing faculty at Purdue University in Indiana. The Owl is also concise and easy to use. It is not meant to replace the manual but only to supplement it and I find it a prime resource.
If you have any questions at all then you can always schedule a research coach or e-mail the APA style experts at email@example.com