References

Epstein, A., Park, J. & Casey, A. (1961). The current status of the size-distance hypothesis. Psychological Bulletin, 58, 491-514.

Gray, Peter. (1994). Psychology (2nd Edition). New York: Worth Publishers, Inc.

Matlin, M. W. (1988). Sensation and perception (2nd edition). Boston, MA: Allyn and Bacon.

Myers, David G. (1995). Psychology (4th Edition). New York: Worth Publishers, Inc.

Myers, David G. (1996). Exploring Psychology (3rd Edition). New York: Worth Publishers, Inc.

Rock, I. (1984). Perception. New York: Scientific American Books.

Shepard, R. N. (1990). Mind sights. New York: Freeman.