1. Logical Thinking in Second Grade. New York: Columbia University College Press, 1970.
2. Science teaching and the development of thinking. Dissertation, University of Gothenburg, Sweden, 1976.
3. An experimental study of SCIS involving 4th graders' ability to understand concepts of relative position and motion using the planetarium as a testing device. Dissertation, Michigan State University, 1972.
4. Scientific curriculum improvement study and the development of scientific literacy. Dissertation, University of California, Berkeley, 1975.