1. Austin, G. Early Childhood Education in Eight O.E.C.D. Countries, 1972.
2. Bereiter, C. Pre-school programs for the disadvantaged: Five Experimental Approaches to Early Childhood Education. Stanley, J. C. (Ed.). John Hopkins University Press, 1972.
3. Bloom, B. Stability and Change in Human Characteristics. New York, N.Y. John Wiley and Sons, Inc. 1964.
4. Van Calcar, C. Development of Compensatory Early Childhood Education. Bernard van Leer Foundation, Cursem/pe/12. The Hague, 3rd November, 1972.
5. Coleman, J. Equality of Educational Opportunity. Washington, D.C. U.S. Government Printing Office, 1966.