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http://www.worldbookonline.com/student/article?id=ar275680 books:Mcdougal, Holt. "Chapter 4." World Studies: The Ancient World. S.l.: Pearson Prentice Hall, 2007. N. pag. Print.
Cranny, Michael William. "Chapter 4." Pathways Civilizations through Time. Toronto, Ont.: Pearson Canada, 2012. N. pag. Print. |