1. Bower, G. H. Mental imagery and associative learning. In L. Gregg (Ed.),Cognition in learning and memory. New York: Wiley, 1972.
2. Clark, H. H. More about “adjectives, comparatives, and syllogisms”: A reply to Huttenlocher and Higgins. Psychological Review, 1972, 78, 505–514.
3. Cooper, L. A., & Shepard, R. W. Chronometric studies of the rotation of mental images. Paper presented at the Symposium on Visual Information Processing, Carnegie-Mellon University, May 18–19, 1972.
4. Gibson, E. J.Principles of perceptual learning and development. New York: Appleton-Century-Crofts, 1967.
5. Huttenlocher, J., & Higgins, E. T. Adjectives, comparatives and syllogisms. Psychological Review, 1971, 78, 487–504.