Henle, Michael, and Brian Hopkins, editors. “Preface.” Martin Gardner in the Twenty-First Century, 1st ed., Mathematical Association of America, 2012, pp. v-viii, www.jstor.org/stable/10.4169/j.ctt13x0ng0.2. Accessed 3 Mar. 2021.
Preface. (2012). In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. V-Viii). Mathematical Association of America. Retrieved March 3, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.2
"Preface." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, V-Viii. Mathematical Association of America, 2012. Accessed March 3, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.2.
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