James, William "Introduction to perception". 1997
<http://www.illusionworks.com/htm1/introduction to perception.htm>
(1-12-99)
 
Printed Materials

Brandreth, Gyles "The Great Book of Optical Illusion" .New York: Sterling
Publishing, 1985

Davison, Hugh "The Physiology of The Eye" .New York and San Francisco:
Academic Press, 1976
 

Book

John, Lancaster. "Introducing Op Art". New York Watson-Guptill
Publications, 1973.

"World Book Encyclopedia" published by World Book, 1997
(March 2, 1999)