References

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

Moorecroft, W. (1993). Sleep, dreaming, and sleep disorders: An introduction (2nd edition). Landam, MD: University Press of America.

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.

Webb, W. B. (1992). Sleep: The gentle tyrant (2nd edition). Bolton, MA: Anker Publishing.