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MLA
O’Shea, Owen. “Sam Loyd’s Courier Problem with Diophantus, Pythagoras, and Martin Gardner.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 201–206, www.jstor.org/stable/10.4169/j.ctt13x0ng0.30. Accessed 10 Aug. 2020.
APA
O’Shea, O. (2012). Sam Loyd’s Courier Problem with Diophantus, Pythagoras, and Martin Gardner. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 201-206). Mathematical Association of America. Retrieved August 10, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.30
CHICAGO
O’Shea, Owen. "Sam Loyd’s Courier Problem with Diophantus, Pythagoras, and Martin Gardner." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 201-06. Mathematical Association of America, 2012. Accessed August 10, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.30.

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