1. Inquiry Objectives in the Teaching of Bkology. Mid-continent Regional Educational Laboratory, Kansas City, Missouri, 1969.
2. Biological Science Curriculum Study, Biological Science: Molecules to Man. Houghton Mifflin Co., Boston, 1968.
3. The Process of Education. Harvard University Press, Cambridge, 1960.
4. personal communication, October 17, 1969.
5. Intraclass Correlation and the Analysis of Variance. Dryden Press, New York, 1958. P. 105.