References
Biber, B. (1984). Early education and psychological development. New Haven, CT: Yale University Press.
Elkind, D. (1986), Formal education and early childhood education: An essential difference. Phi Delta Kappan, 5, 631-636.
Goodman, W., & Goodman, L. (1982), Measuring young children. In B. Spodek (Ed.), Handbook of research in early childhood education (pp. ). New York. Free Press.