- Siegler, R.s. (1998). Children's Thinking. (3the ed.). Upper Saddle River, NJ: Prentice Hall. ISBN: 0133979105.
- Miller, S.A. (1998). Developmental Research Methods. (2th ed.). Prentice Hall, New Jersey. ISBN: 0133988929.
- Schaffer, H.R. (1996). Social Development. Oxford, Blackwell Press. ISBN: 0631185747
- LaFreneigre, P, J. (2000). Emotional Development, A Biosocial Perspective. London: Wadsworth-THomson Learning.
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