Dunst, C.J., Snyder, S.W., & Mankinen, M. (1989). Efficacy of early intervention. In M.C. Wang, M.C. Reynolds, & H.J. Walberg (Eds.), Handbook of special education: Research and practice: Volume 3. Low incidence conditions (pp. 259–294). Oxford, England: Pergamon Press.
2.
Gabor, D. (1964). Inventing the future. New York: Knopf.
3.
Skrtic, T.M. (1991). Behind special education: A critical analysis of professional culture and school organization. Denver: Love.