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APA Style
Cartwright, M. (2013, November 13). Roman Abacus. World History Encyclopedia. Retrieved from https://www.worldhistory.org/image/2147/roman-abacus/
Chicago Style
Cartwright, Mark. "Roman Abacus." World History Encyclopedia. Last modified November 13, 2013. https://www.worldhistory.org/image/2147/roman-abacus/.
MLA Style
Cartwright, Mark. "Roman Abacus." World History Encyclopedia. World History Encyclopedia, 13 Nov 2013. Web. 06 Oct 2024.