Mental Retardation: Definition, Classification, and Systems of Supports. 10th Edition.

By R. Luckasson, S. Borthwick-Duffy, W. Buntinx, D. Coulter, E. M. Craig, A. Reeve, R. Schalock, M. Snell, D. Spitalnik, S. Spreat and 1 more. 2002

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