Owl - Purdue University's Online Writing Lab APA Guide, provides examples of formatting papers, in-text citations, footnotes and endnotes, and reference lists in APA style.
Bibme - A citation generator with an auto-fill function, Bibme allows you search by ISBN, title, or author. In order to download your bibliograpy into a Word document, you must create an account the first time you use Bibme.
Knight Cite - Citation generator available in APA sytle. Make sure you double check any citations created by this program. It will not catch errors such as incorrect capitalization for example.