Tools like PsycINFO and Google Scholar also provide you with APA formatted references. In PsycINFO, select the items you want citations for, then click "Cite" in the upper toolbar. In Google Scholar, click "Cite" for the individual article in the results list:
Complete instructions on citing and useful information on writing style and content can be found in the latest edition of the Publication Manual of the American Psychological Society. We have multiple copies in the Library in reference and on reserve; it's also worth considering buying your own if you are in the social sciences.