1. Cognitive development and problem solving of Afro-American students in chemistry
2. Comparison of the development of ratio concepts in two domains
3. The role of algorithms in teaching problem solving
4. (1662). Two new experiments touching the measure of the force of the spring of air compressed and dilated. In (Ed.), (1965), The Works of Robert Boyle (pp. 156–162). Hildersheim, Germany: Georg Olms.