3Bronfenbrenner, U. (1979). The ecology of human development. Cambridge, MA: Harvard University Press
4Bronfenbrenner, U. (2004). Making human beings human:Bioecological perspectives on human development. Sage publications.
5Bredekamp, S.& Copple, C.(1997). Developmentally appropriate practice in early childhood program (rev. ed.). Washington,D.C.:National Association for the Education of Young Children
6DeVries,R. & Kohlberg. (1987). L. Program of early education, Longman
7Goffin, S. G.(1994). Curriculum models and early childhood education, MacMillan
8Edwards, C., Gandini, L. & Forman, G. (1998). The hundred languages of children. Ablex Publishing Corporation
9Forman,G.& Hill, F.(1984).Constructive play: Applying Piaget in the preschool, Addison-Wesley Publishing Company
10Kamii, C.& DeVries,R.(1978).Physical knowledge in preschool education: Implications of Piaget's theory. Prentice-Hall