Neisworth, J. T., & Smith, R. M. (1978). Retardation: Issues, assessment, and intervention. McGraw-Hill.

Neisworth, John T., and Robert McNeil Smith. Retardation: Issues, Assessment, and Intervention. New York: McGraw-Hill, 1978.

Neisworth, John T., and Robert McNeil Smith. Retardation: Issues, Assessment, and Intervention. McGraw-Hill, 1978.