Hsin-Po Wang. “Congo Bongo.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 195–200, www.jstor.org/stable/10.4169/j.ctt13x0ng0.29. Accessed 6 Aug. 2020.
Hsin-Po Wang. (2012). Congo Bongo. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 195-200). Mathematical Association of America. Retrieved August 6, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.29
Hsin-Po Wang. "Congo Bongo." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 195-200. Mathematical Association of America, 2012. Accessed August 6, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.29.
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