"World Book Online Reference Center | Online Reference Book| Online Encyclopedia."World Book. N.p., n.d. Web. 11 June 2012. <http://www.worldbookonline.com/advanced/article?id=ar299420>.
"World Book Online Reference Center | Online Reference Book| Online Encyclopedia."World Book. N.p., n.d. Web. 11 June 2012. <http://www.worldbookonline.com/advanced/extmedia?id=ar299420>
"World Book Online Reference Center | Online Reference Book| Online Encyclopedia."World Book. N.p., n.d. Web. 11 June 2012. <http://www.worldbookonline.com/advanced/extmedia?id=ar299420>.
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