APA (7th ed.) Citation

American Association on Mental Retardation & Luckasson, R. (1992). Mental retardation: Definition, classification, and systems of supports (9th ed.). American Association on Mental Retardation.

Chicago Style (17th ed.) Citation

American Association on Mental Retardation and Ruth Luckasson. Mental Retardation: Definition, Classification, and Systems of Supports. 9th ed. Washington: American Association on Mental Retardation, 1992.

MLA (9th ed.) Citation

American Association on Mental Retardation and Ruth Luckasson. Mental Retardation: Definition, Classification, and Systems of Supports. 9th ed. American Association on Mental Retardation, 1992.