Henle, Frederick V., and James M. Henle. “Squaring the Plane.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 143–152, www.jstor.org/stable/10.4169/j.ctt13x0ng0.22. Accessed 12 Aug. 2020.
Henle, F., & Henle, J. (2012). Squaring the Plane. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 143-152). Mathematical Association of America. Retrieved August 12, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.22
Henle, Frederick V., and James M. Henle. "Squaring the Plane." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 143-52. Mathematical Association of America, 2012. Accessed August 12, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.22.
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