According to the Publication Manual of the American Psychological Association, this is a situation where the association is both author and publisher. In the text, cite the name of the association and the name of the manual in full at the first mention; therafter, you may refer to the traditional DSM form, e.g. DSM-IV-TR (2000) text revision. An example of a citation in a reference list is as follows:
American Psychiatric Association. (2000). Diagnostic and statistical
manual of mental disorders (4th ed., text revision). Washington, DC: Author.