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MLA
Watkins, John J. “Triangular Numbers, Gaussian Integers, and KenKen.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 173–178, www.jstor.org/stable/10.4169/j.ctt13x0ng0.26. Accessed 11 Aug. 2020.
APA
Watkins, J. (2012). Triangular Numbers, Gaussian Integers, and KenKen. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 173-178). Mathematical Association of America. Retrieved August 11, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.26
CHICAGO
Watkins, John J. "Triangular Numbers, Gaussian Integers, and KenKen." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 173-78. Mathematical Association of America, 2012. Accessed August 11, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.26.

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