1. Bonjean, C. M., Hill, R. J.,&. McLemore, D. S. Continuities in measurement: 1959–1963.Social Forces, 1965,43, 532–536.
2. Campbell, D. T., & Stanley, J. C. Experimental and quasi-experimental designs for research. Chicago: Rand McNally, 1963.
3. Also in N. L. Gage (Ed.),Handbook of research on teaching. Chicago: Rand McNally, 1963.
4. Filep, R. T. The impact of research on utilization of media for educational purposes. New York: Institute for Educational Development, 1970.
5. Gephart, W. J. Criteria for methodological adequacy for research on educational change. University of Wisconsin-Milwaukee, September 1965. (Mimeograph)