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"Manas: History and Politics, Indus Valley." Indus Valley Civilization. Web. 06 Dec. 2011. a href="http://www.sscnet.ucla.edu/southasia/History/Ancient/Indus2.html">http://www.sscnet.ucla.edu/southasia/History/Ancient/Indus2.html>.

 "Indus River Valley Civilizations." World History International: World History Essays From Prehistory To The Present. Web. 02 Dec. 2011. a href="http://history-world.org/indus_valley.htm">http://history-world.org/indus_valley.htm>.

"Manas: History and Politics, Indus Valley." Indus Valley Civilization. Web. 06 Dec. 2011. a href="http://www.sscnet.ucla.edu/southasia/History/Ancient/Indus2.html">http://www.sscnet.ucla.edu/southasia/History/Ancient/Indus2.html>.

"Mayan Civilization." Gale Encyclopedia of World History: Governments. Vol. 1. Detroit: Gale, 2008. Gale Virtual Reference Library. Web. 7 Dec. 2011.
Document URL
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Kenoyer, Jonathan Mark. "Indus Valley Civilization." Encyclopedia of India. Ed. Stanley Wolpert. Vol. 2. Detroit: Charles Scribner's Sons, 2006. 258-267. Gale Virtual Reference Library. Web. 7 Dec. 2011.
Document URL
http://go.galegroup.com/ps/i.do?id=GALE%7CCX3446500288&v=2.1&am...