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"The Black Death." The Black Death. N.p., n.d. Web. 29 Nov. 2012. <http://deathblack.wordpress.com/category/statistics/>.
"Mongolia Timeline." About.com Ancient / Classical History. N.p., n.d. Web. 29 Nov. 2012. <http://ancienthistory.about.com/od/timelines/a/Mongoliatime.htm>.
"THE MIDDLE AGES: THE FEUDAL SYSTEM." ThinkQuest. Oracle Foundation, n.d. Web. 29 Nov. 2012. <http://library.thinkquest.org/10949/fief/hifeudal.html>.
"Joan of Arc." Joan of Arc. N.p., n.d. Web. 29 Nov. 2012. <http://www.distinguishedwomen.com/biographies/joanarc.html>.