1. Barnard, K., Bee, H., & Hammond, M. (1984). Home environment and cognitive development in a healthy, low risk sample: The Seattle Study. In A. Gottfried (Ed.), Home environment and early cognitive development (pp. 117–150). New York: Academic.
2. Barnett, W. S. (1985). Benefit-cost analysis of the Perry Preschool program and its long-term effects. Educational Evaluation and Policy Analysis, 7, 387–414.
3. Barth, F. (Ed.). (1969). Ethnic groups and boundaries: The social organization of culture difference. Boston: Little, Brown.
4. Bertalanffy, L. V. (1975). Perspectives on general system theory. New York: Braziller.
5. Blair, C., Ramey, C. T., & Hardin, M. (1995). Early intervention for low birth weight premature infants: Participation and intellectual development. American Journal on Mental Retardation, 99, 542–554.