Gardner, Martin. “Modeling Mathematics with Playing Cards.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 221–226, www.jstor.org/stable/10.4169/j.ctt13x0ng0.33. Accessed 3 Mar. 2021.
Gardner, M. (2012). Modeling Mathematics with Playing Cards. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 221-226). Mathematical Association of America. Retrieved March 3, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.33
Gardner, Martin. "Modeling Mathematics with Playing Cards." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 221-26. Mathematical Association of America, 2012. Accessed March 3, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.33.
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