1. Barrett, B.H., & Lindsley, O.R. (1962). Deficits in acquisition of operant discrimination and differentiation shown by institutionalized retarded children. American Journal of Mental Deficiency, 67, 424–436.
2. Baumeister, A., & Klosowski, R. (1965). An attempt to group toilet trained severely retarded patients. Mental Retardation, 3, 24–26.
3. Baumtrog, C. (1985). Effectiveness of behavior reduction procedures with individuals who are severely handicapped. A meta-analysis. Unpublished doctoral dissertation, University of Minnesota, Minneapolis.
4. Bijou, S.W. (1963). Theory and research in mental (developmental) retardation. Psychological Record, 13, 95–110.
5. Brown, L., Nietupski, J., & Hamre-Nietupski, S. (1976). Criterion of ultimate functioning. In M.A. Thomas (Ed.), Hey, don’t forget about me! Reston, VA: Council for Exceptional Children.