Henle, Michael, and Brian Hopkins, editors. “Index.” Martin Gardner in the Twenty-First Century, 1st ed., Mathematical Association of America, 2012, pp. 293–296, www.jstor.org/stable/10.4169/j.ctt13x0ng0.45. Accessed 27 Feb. 2021.
Index. (2012). In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 293-296). Mathematical Association of America. Retrieved February 27, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.45
"Index." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 293-96. Mathematical Association of America, 2012. Accessed February 27, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.45.
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