Schaie, K.W. (2005). Developmental influences on adult intelligence: The Seattle longitudinal study. New York: Oxford University Press.
Sheldon, K.M., Houser-Marko, L., and Kasser, T. (2006). Does autonomy increase with age? Comparing the goal motivations of college students and their parents. Journal of Research in Personality, 40(2), 168-178.
U.S. Department of Education, Office of the Under Secretary. (2003). When schools stay open late: The national evaluation of the 21st century community learning centers program: First-year findings. Washington, DC: U.S. Government Printing Office.
Zacharia, Z., and Calabrese Barton, A. (2003). Urban middle-school students’ attitudes toward a defined science. Science Education, 88(2), 1-27.
Zinicola, D., and Devlin-Scherer, R., (2001). A university-museum partnership for teacher education field experiences in science. Clearing House, 74(5), 248-250.