General
Credo Reference - a good place to start to get background information on your topic; reference articles from over 600 titles, with particular emphasis on encyclopedias, dictionaries, atlases, and handbooks.
Medical
DSM Library - Includes the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th edition), the DSM-5 Handbook of Differential Diagnosis, and DSM-5 Clinical Cases.
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