1. Students' conceptions about the vector characteristics of three physics concepts
2. Sunlight, Earth Life
3. (1972). Asimov's biographical encyclopedia of science and technology. New York: Avon Books.
4. (1968). Educational psychology: A cognitive view. New York: Holt, Rinehart, and Winston, Inc.
5. & (1968). A course in biology. Reading, Massachusetts: Addison-Wesley Publishing Company.