Closing Comments

1. Gardner, R. W. The development of cognitive structures. In: Cognition: Theory, Research, Promise, ed. C. Scheerer . New York: Harper, 1964, pp. 147–171.

2. Gardner, R. W. Some effects of severe disequilibration on the cognitive functioning of the child. Acad. Ther. Quart., 2:203–214, 1967.