1. The Teaching of Science in Elementary and Secondary Schools. New York: Longmans, Green and Company. 1939. p. 24.
2. Measuring the scientific attitude.
3. Department of Biological Science, Guide for Laboratory Studies in Biological Science. East Lansing: Michigan State College Press. 1949. pp. 359.
4. Department of Biological Science, Guide for Laboratory Studies in Biological Science. East Lansing: Mcihigan State College Press. 1949. pp. 359.