Gardner, Martin. “The Asymmetric Propeller.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 3–6, www.jstor.org/stable/10.4169/j.ctt13x0ng0.4. Accessed 27 Feb. 2021.
Gardner, M. (2012). The Asymmetric Propeller. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 3-6). Mathematical Association of America. Retrieved February 27, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.4
Gardner, Martin. "The Asymmetric Propeller." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 3-6. Mathematical Association of America, 2012. Accessed February 27, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.4.
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