1. , , , , & (1984). Chemistry, second edition. New York: Academic.
2. & (1978). Chemical principles. New York: Harper and Row.
3. , & (in press). The Purdue visualization of rotations test, Journal of Research in Science Teaching.
4. (1984). A study of the relationships between spatial ability, sex, and success in general chemistry. Unpublished master's thesis, Purdue University, West Lafayette, IN.
5. , & (1976). Manual for kit of factor referenced cognitive tests. Educational Testing Service, Princeton, NJ.