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Anderson, S.B. , & Ball, S. The profession and practice of program evaluation. San Francisco: Jossey-Bass, 1978.

Brickell, H.M. The influence of external political factors on the role and methodogy of evaluation . In T. D. Cook (Ed.), Evaluation studies reviett, annual, vol. 3. Beverly Hills, CA: Sage, 1978.

Connor, R. Selecting a control group: An analysis of the randomization process in twelve social reform programs. Evaluation Quarterly, 1977, 1, 195-244.

House, E.R. Evaluating with validity. Beverly Hills, CA: Sage, 1980.

House, E.R. Justice in evaluation. In G. V. Glass (Ed.), Evaluation studies review annual. vol. 1. Beverly Hills, CA: Sage, 1976.

Morell, J.M. Program evaluation in social research. New York: Pergamon, 1979.

Rossi, P.H. , Freeman, H.E. , & Wright, S. R. Evaluation : A systematic approach. Beverly Hills, CA: Sage, 1979.

Weiss, C.H. Evaluation research. Englewood Cliffs, NJ: Prentice-Hall, 1972.

Wortman, C.B. , & Rabinowitz, V.C. Random assignment: The fairest of them all. In L. Sechrest (Ed.), Evaluation studies review annual, vol. 4. Beverly Hills, CA: Sage, 1979.