Credo is an online collection of dictionaries, encyclopedias, handbooks, etc. covering topics from the arts to the sciences and including a large number of psychology reference sources.
For additional encyclopedias in print, search BobCat for the subject heading:
Oxford Bibliographies in Psychology is a quick, comprehensive, and efficient source for exploring or staying current with the growing science of psychology.
Oxford Handbooks Online publishes original, peer reviewed, research reviews covering the key issues and exploring major debates in psychology and other disciplines.