Klineberg, O. "Negro-White Differences in Intelligence Test Performance, a New Look at an Old Problem" American Psychol. , 1963, Vol. 18, pp. 198-203.
2.
White, M.A. & Harris, M.W.The School Psychologist. (Harper and Bros.1961) New York City.
3.
Deutsch, Martin.Minority Group and Class Status as Related to Social and Personality Factors in Scholastic Achievement. Monograph #2, 1960. Society for Applied Anthropology. Cornell University, Ithaca, New York.
4.
Guilford, J.P. "Three Faces of Intellect." American Psychol., 1959, Vol. 14, pp. 469-480.
