Find, for example:
Search WorldCat Discovery for the DSM-5.
American Psychiatric Association, DSM-5 Task Force. (2013). Diagnostic and statistical manual of mental disorders: DSM-5™ (5th ed.). Arlington, VA, US: American Psychiatric Publishing, Inc.
See also: How to Cite the DSM–5 in APA Style and Cressman Library LibGuide for APA Style.