Physical Knowledge in Preschool Education: Implications of Piaget's Theory Constance Kamii and Rheta De Vries. Englewood Cliffs,N.J.: Prentice Hall,1978,321 pp. $12.95 hardbound

Piaget, J. Science of education and the psychology of the child. New York: Viking, 1971.

Piaget, J. To understand is to invent. New York: Grossman, 1973.

Shore, M. Soviet education. New York: Philosophical Library, 1947.