Stewart, Ian. “Cups and Downs.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 181–186, www.jstor.org/stable/10.4169/j.ctt13x0ng0.27. Accessed 4 Mar. 2021.
Stewart, I. (2012). Cups and Downs. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 181-186). Mathematical Association of America. Retrieved March 4, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.27
Stewart, Ian. "Cups and Downs." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 181-86. Mathematical Association of America, 2012. Accessed March 4, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.27.
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