Comparative Study of the Preceptions of Superior Students,Teachers,and Principals as To Utilization of Recommended Classroom Practices

Walker, A.M. and Lev, J. , Statistical Inference, New York: Henry Holt & Co., 1953, pp. 283-86.

Wallen, Norman E. and Travers, Robert M. W. , "Analysis and Investigation of Teaching Methods," Handbook of Research on Teaching, N. L. Gage (Editor), American Educational Research Association, Chicago: Rand McNally, 1963, p. 468.

Ibid, p. 470.