Bower, E.The Education of Emotionally Handicapped Children. Sacramento : California State Department of Education , 1961.
2.
Edwards, A.Exper mental Design in Psychological Research. New York : Holt, Rinehart and Winston, 1964 .
3.
McDermott, J. , Harrison, S., Schrager , J. and Wilson. P. "Social class and mental illness in children: observations of blue-collar families." American Journal of Orthopsychiatry, 1965, 35, 500-508.
4.
Picken, B. and Ireland, G. "Family patterns of medical care utilisation." Journal of Chronic Diseases, 1969. 22, 181-191.
5.
Wenar, C. "The reliability of mothers' histories." Child Development , 1961, 32, 491-500.