Bronfenbrenner, U.Is early intervention effective? In M. Guttentag & E. Struening (Eds.), Handbook of evaluation and research. Beverly Hills, Calif.: Sage Publications, 1962.
2.
Delbecq, A.S., Van de Ven, A.H. & Gustafson, D.H.Group techniques for program planning: A guide to nominal group and Delphi processes. Glenview, Ill.: Scott, Foresman and Co., 1975.
3.
Denzin, N.The research act: A theoretical introduction to sociological methods. Chicago: Aldine, 1970.
Hocutt, A.Parent involvement policy and practice: A study of parental participation in early education projects for handicapped children. Doctoral dissertation, University of North Carolina, Chapel Hill, 1980.
6.
Karnes, M.B., & Teska, J.A.Children's response to intervention programs. In J.J. Gallagher (Ed.), The application of child development research to exceptional childrenReston, Va.: Council for Exceptional Children, 1975.
Rutherford, W. The personal interview: A tool for investigating and understanding change in schools. Paper presented at the annual meeting of the American Educational Research Association, Toronto, Canada, March, 1978.
9.
Selltiz, C., Jahoda, M., Deutsch, M., & Cook, S.Research methods in social relations. New York: Holt, Rinehart & Winston, 1965.