Henle, Michael, and Brian Hopkins, editors. “About the Editors.” Martin Gardner in the Twenty-First Century, 1st ed., Mathematical Association of America, 2012, pp. 297–297, www.jstor.org/stable/10.4169/j.ctt13x0ng0.46. Accessed 26 Feb. 2021.
About the Editors. (2012). In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (p. 297). Mathematical Association of America. Retrieved February 26, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.46
"About the Editors." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 297. Mathematical Association of America, 2012. Accessed February 26, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.46.
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