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T. F. HOAD. "arithmetic." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 9 Feb. 2010 <http://www.encyclopedia.com>.
T. F. HOAD. "arithmetic." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 9, 2010). http://www.encyclopedia.com/doc/1O27-arithmetic.html
T. F. HOAD. "arithmetic." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 09, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-arithmetic.html
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