Barnett, W.S. (1992). Benefits of compensatory preschool education. Journal of Human Resources, 27, 279-312.
2.
Schweinhart, L.J., Barnes, H.V., &Weikart, D.P. (1993). Significant benefits: The high/scope Perry preschool study through age 27. Ypsilanti, MI: High/Scope Press.
3.
White, K.R. (1986). Efficacy of early intervention. Journal of Special Education, 19,401-416.
4.
Zigler, E., &Styfco, S.J. (Eds.). (1993). Head Start and beyond . New Haven, CT: Yale University Press.