Many psychology and clinical psychology reference books are found in the Reference Room in the 150 and 616 call number ranges -- for example:
DSM-IV sourcebook / edited by Thomas A. Widiger ... [et al]. MAIN Reference (Non-circulating) Call number: 616.89075 D8114 (4 vols)
Handbook of clinical psychology / edited by Michel Hersen, Alan M. Gross.MAIN Reference (Non-circulating) Call number: 616.89 H23638 (2 vols)
Handbook of psychology / Irving B. Weiner, editor-in-chief. MAIN Reference (Non-circulating) Call number: 150 H2357 (12 vols)
Gale Virtual Reference Library
Searchable database of approximately fifty full text encyclopedias, dictionaries and other reference books in the areas of the arts, business, education, history, information and publishing, law, medicine, multicultural studies, nation and world, religion, and social science.
Searchable access to a collection of aggregated and integrated encyclopedias and reference books across many subjects.