1. Bahrick, H. P., Clark, S., &Bahrick, P. Generalization gradients as indicants of learning and retention of a recognition task.Journal of Experimental Psychology, 1967,75, 464–471.
2. Bower, G. H. A multicomponent theory of the memory trace. In K. W. Spence & J. T. Spence (Eds.),The psychology of learning and motivation (Vol. 10). New York: Academic Press, 1967.
3. Brooks, L. Nonanalytic concept formation and memory for instances. In E. Rosch & B. B. Lloyd (Eds.),Cognition and categorization. Hillsdale, N.J: Erlbaum, 1978.
4. Gibson, E. J. A systematic application of the concepts of generalization and differentiation to verbal learning.Psychological Review, 1940,47, 196–229.
5. Hintzman, D. L. The psychology of learning and memory. San Francisco: Freeman, 1978.