MLA

Allen, John D. Gay, Lesbian, Bisexual, and Transgender People with Developmental Disabilities and Mental Retardation. New York: Harrington Park Press, 2003.

APA

Allen, J. D. (2003). Gay, lesbian, bisexual, and transgender people with developmental disabilities and mental retardation. New York: Harrington Park Press.

Chicago

Allen, John D. Gay, Lesbian, Bisexual, and Transgender People with Developmental Disabilities and Mental Retardation. New York: Harrington Park Press, 2003.