Sources of Further Information

Websites

University of Illinois online meteorology guides including images and explanations of rainbows
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/home.rxml

Arizona State University Patterns in Nature site including explanations of rainbows and activities.
http://acept.la.asu.edu/PiN/rdg/rainbow/rainbow.shtml

The Rainbow Bridge, Chapter 8, What are "all the colors of the rainbow"? including a history of explanations of rainbows.
http://www.usna.edu/Users/oceano/raylee/RainbowBridge/Chapter_8.html

Australian Severe Weather site including pictures of rainbows
http://australiasevereweather.com/

AKM (German Halo Workgroup) site including pictures of halo forms
http://www.meteoros.de/indexe.htm

Atmospheric Optics site including explanations of halo forms.
http://www.sundog.clara.co.uk/halo/halosim.htm

Books

Lee, R. L., Jr. and A. B. Fraser: The Rainbow Bridge: Rainbows in Art, Myth, and Science, Penn State Press, 2001.
Minnaert, M. Light and Color in the Outdoors, Springer, 1993.
Boyer, C. The Rainbow from Myth to Mathematics, Yoseloff, 1959.
Bohren, C. Clouds in a Glass of Beer, Wiley, 1987.