1. Thomas, R. M. (1979). Comparing theories of child development Belmont:
2. California.Decaprio,N.S.Personality Theories:A guide to human nature C.B.S College Publishing,1963
3. Papalia,D.E.and olds,S.W.Human Development McGraw Hill,1978.
4. Maier,H.W.Three Theories on Child Development Harper and Row,1978.
5. Langer,J.Theories of Child Development,Holt Rinehart,1969.
6. Dyrne,D.and Relley,K.An Introduction to Personality.Prentice Hall,1981.
7. Looft,A Development Psychology,A Book of Readings Dryden Press,1972.
8. Gruber,H.E.and Vonecha,J.J. the essential Piaget Vincent Torre,1976.
9. Baldwin theories of Child Development.