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__chemical elements.com__. Yinon Bentor, page creator (Author). 3 February 2008. http://www.chemicalelements.com/index.html

__Sulfur History__. Jerry J. Jennet, president. 3 February 2008.http://georgiagulfsulfur.com/history.htm

__Sulfur__. 3 February 2008.[| http://periodictable.mysterymaster.com/sulfur.html]

Holt, Rineheart and Winston. __Introduction to Matter__. Austin, Texas, Holts Science and Technology 2002. http://periodictable.mysterymaster.com/sulfur.html