Alkek's writing style guide for APA can also be helpful, as well as resources like:
Reference Material in the form of subject dictionaries, encyclopedias, and handbooks typically provide background essays, definitions, broad overviews of various topics, or other pertinent facts. The three bullets below list collections of searchable eReference titles and each offers a collection of Psychology titles:
Infed Online Encyclopedia - Theory and practice of informal education, social pedagogy, lifelong learning, social action, and community learning & development.
Annual Reviews - Yearly reviews of the significant research in the sciences and social sciences (political Science, Psychology, Public Health, Sociology)