1. "Fertile Crescent." A Dictionary of World History. Ed. Dr Alan Isaacs, Fran Alexander, Jonathan Law, Elizabeth Martin, Edmund Wright. 2006. History Study Center. Web. 8 Sept. 2014.
2. "East Asian History Sourcebook." Paul Halsall, 13 Mar. 2007. Web. 5 Oct. 2014. <http%3A%2F%2Fwww.fordham.edu%2FHalsall%2Feastasia%2Feastasiasbook.asp%23Cultural%20Origins.>.
3. "Mesopotamia the Cradle of Civilizations." Mesopotamia Five, n.d. Web. <https%3A%2F%2Fancientenvironments.wikispaces.com%2FMesopotamia%2BFive>.
4. Dlott, Ann M. "Ancient Mesopotamia." Ancient Mesopotamia. Able Media, 2011. Web. 05 Oct. 2014. <http://ablemedia.com/ctcweb/showcase/dlottmesopotamia1.html>.
5. Szczepanski, Kallie. "What Role Has the Yellow River Played in China's History?" About. About Education, n.d. Web. 05 Oct. 2014. <http://asianhistory.about.com/od/china/f/Yellow-River-Chinese-History.htm>.
6. "The Huang He River Valley." The Huang He River Valley. N.p., n.d. Web. 05 Oct. 2014. <http://server1.lomaprieta.santacruz.k12.ca.us/MissionHill/accesshtml.cgi/u/MissionHill/rhardie/assignments/Becky4thAC.html>.
2. "East Asian History Sourcebook." Paul Halsall, 13 Mar. 2007. Web. 5 Oct. 2014. <http%3A%2F%2Fwww.fordham.edu%2FHalsall%2Feastasia%2Feastasiasbook.asp%23Cultural%20Origins.>.
3. "Mesopotamia the Cradle of Civilizations." Mesopotamia Five, n.d. Web. <https%3A%2F%2Fancientenvironments.wikispaces.com%2FMesopotamia%2BFive>.
4. Dlott, Ann M. "Ancient Mesopotamia." Ancient Mesopotamia. Able Media, 2011. Web. 05 Oct. 2014. <http://ablemedia.com/ctcweb/showcase/dlottmesopotamia1.html>.
5. Szczepanski, Kallie. "What Role Has the Yellow River Played in China's History?" About. About Education, n.d. Web. 05 Oct. 2014. <http://asianhistory.about.com/od/china/f/Yellow-River-Chinese-History.htm>.
6. "The Huang He River Valley." The Huang He River Valley. N.p., n.d. Web. 05 Oct. 2014. <http://server1.lomaprieta.santacruz.k12.ca.us/MissionHill/accesshtml.cgi/u/MissionHill/rhardie/assignments/Becky4thAC.html>.