MLA

Fletcher, Robert J, and Frank J Menolascino. Mental Retardation and Mental Illness : Assessment, Treatment, and Service for the Dually Diagnosed. Lexington, Mass.: Lexington Books, 1989.

APA

Fletcher, R. J, & Menolascino, F. J. (1989). Mental retardation and mental illness : assessment, treatment, and service for the dually diagnosed. Lexington, Mass.: Lexington Books.

Chicago

Fletcher, Robert J. ed., and Frank J. Menolascino ed. Mental Retardation and Mental Illness: Assessment, Treatment, and Service for the Dually Diagnosed. Lexington, Mass.: Lexington Books, 1989.