References

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

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.

Tolman, E. C., & Honzik, C. H. (1930). Introduction and removal of reward, and maze performance in rats. University of California Publications in Psychology, 4, 257-275.