BibMe - the fully automatic & free bibliography maker (MLA, APA & Chicago)
The fully automatic bibliography maker that auto-fills. It's the quickest way to build a works cited page. And it's free.
Diigo Imports
The OWL at Purdue - APA Formatting and Style Guide -
A condense version of the APA Manual of Style, this website is invaluable to researchers. Formatting and style is explained concisely and examples are given in all sections.