1. Verbal interaction in science inquiries by homogeneous and heterogeneous small groups. Doctoral dissertation, Florida State University, 1973.
2. , , , , and A system for classifying thought processes in the context of classroom verbal interaction. Institute for Research on Exceptional Children, February, 1965, University of Illinois, Cooperative Research Project No. 965, United States Office of Education Department of Housing and Economic Welfare.
3. Personality. New York: McGraw-Hill, 1959.
4. Intellectual factors in productive thinking. In and (Eds.), Explorations in creativity. New York: Harper & Row, 1967, pp. 281–287. (a)
5. The nature of human intelligence. New York: McGraw-Hill, 1967. (b)