Bibliography
http://www.chemicalelements.com/elements/c.html

http://www.shef.ac.uk/chemistry/web-elements/webelements/elements/text/key/C.html

http://aj.encyclopedia.com/articles/02292.html

Compton's Encyclopedia volume 4, 1972, F.E. Compton Company, p 132-134

Compton's Encyclopedia volume 6, 1972, F.E. Compton Company, p 100-103

The New College Encyclopedia, 1978, Banner Press Inc, New York, p 157

The Tormont Webster's Illustrated Encyclopedic Dictionary, 1990, Tormont Publications Inc, Montreal, p 270

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