DSM Library This link opens in a new windowThe American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM-5®) is used by clinicians and researchers to diagnose and classify mental disorders. In addition to DSM-5, DSM-5 Library provides unlimited access to DSM-5 Handbook of Differential Diagnosis, DSM-5 Clinical Cases, and the Spanish Edition of the Desk Reference to the Diagnostic Criteria from DSM-5.