Links to several APA Citation Guides are listed in the box to the left. I also recommend that you purchase the sixth edition of Publication Manual of the American Psychological Association. Copies are available in the MU Bookstore.
Both the Ebsco databases and Dissertations & Theses have an automatic citation feature. Use this feature by clicking on the "cite" link and then choosing APA. This feature is a time-saver but make sure you double check the format. When in doubt, consult the Publication Manual and/or Dr. Nicholson.