McGillicuddy, N. B. (2006). A Review of Substance Use Research Among Those With Mental Retardation. Mental Retardation and Developmental Disabilities Research Reviews (12). pp. 41-47.
United Nations General Assembly (1993). The Standard Rules on the Equalization of Opportunities for Persons with Disabilities. Forty-eighth session of the United Nations General Assembly. United Nations. Available at: www.un.org/esa/socdev/enable/dissre00.htm