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LeMay, H. Eugene Jr. et al. Chemistry: Connections to Our Changing World. 2d ed. Upper Saddle River, NJ: Prentice Hall, 2006.

McKeever, Susan et al, eds. The Dorling Kindersley Science Encyclopedia. New York: Dorling Kindersley, 1993.

Kerr, J. Alistair. Academic American Encyclopedia. Library ed. Vol. 20. Danbury: Grolier, 1998.