1. (1974). Developmental Psychopathology. Ronald Press, New York.
2. (1986). Comprehensive Test of Adaptive Behaviour, Merrill, Ohio.
3. (1961). Epidemiology and Genetics of Mental Deficiency in a Southern Swedish Population, Almquist and Wiksells, Uppsala.
4. (1985). Marriage and Parenting: Effective Decision Making for the Developmentally Disabled. Stanfield House, Los Angeles.