References
- Viet , S. , Allen , G. and Chinsky , J. 1976 . Interpersonal Interactions between Institutionalized Retarded Children and their Attendants . American Journal of Mental Deficiency , 80 : 535 – 542 .
- Weiner , E. and Werner , B. 1974 . Differentiation of Retarded and Normal Children through Toy Play Analysis . Multivariate Behavioural Research , 9 : 245 – 252 .
- Wolfensberger , W. and Glenn , L. 1975 . Program Analysis of Service Systems 3 , Toronto : National Institute of Mental Retardation .