Cita APA (7th ed.)

(2002). Mental retardation: Definition, classification, and systems of supports (10a. ed.). American Association on Mental Retardation.

Cita Chicago (17th ed.)

Mental Retardation: Definition, Classification, and Systems of Supports. 10a. ed. Washington, D.C: American Association on Mental Retardation, 2002.

Cita MLA (9th ed.)

Mental Retardation: Definition, Classification, and Systems of Supports. 10a. ed. American Association on Mental Retardation, 2002.