- http://library.thinkquest.org/07aug/02208/4.htm
- http://crystal-cure.com/color-quiz.html
- http://webdesign.about.com/od/colorcharts/l/bl_colorculture.htm
- http://www.colormatters.com/culturematters.htm
- http://www.colorguides.net/color_culture.html
- http://www.infoplease.com/spot/colors.html
