APA (7th ed.) Citation

(1992). Mental retardation: Definition, classification, and systems of supports (9. ed.). American Assoc. on Mental Retardation.

Chicago Style (17th ed.) Citation

Mental Retardation: Definition, Classification, and Systems of Supports. 9. ed. Washington, DC: American Assoc. on Mental Retardation, 1992.

MLA (9th ed.) Citation

Mental Retardation: Definition, Classification, and Systems of Supports. 9. ed. American Assoc. on Mental Retardation, 1992.