1. The Empty Fortress;Bettelheim,1967
2. Systematic observations of play behavior in autistic children;Black;J. Aut. Developm. Dis.,1975
3. Social Development: The Origins and Plasticity of Interchanges;Cairns,1979
4. Developmental language studies in the neuropsychiatric disorders of childhood;Caparulo,1983
5. Developing criteria for establishing interrater reliability of specific items in a given inventory;Cicchetti;Amer. J. Ment. Defic.,1981