1. Medical-Behavioral Research in Retardation;Belmont,1971
2. The ITPA and Down's syndrome: An exploratory study;Bilovsky;American Journal of Mental Deficiency,1965
3. Mental and motor development in young mongol children;Carr;Journal of Mental Deficiency Research,1970
4. Psychological and social development in home reared children with Down's syndrome;Cornwell;American Journal of Mental Deficiency,1969
5. Young Children with Down Syndrome;Corri,1975