Elran, Yossi. “Retrolife and The Pawns Neighbors.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 207–212, www.jstor.org/stable/10.4169/j.ctt13x0ng0.31. Accessed 13 Aug. 2020.
Elran, Y. (2012). Retrolife and The Pawns Neighbors. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 207-212). Mathematical Association of America. Retrieved August 13, 2020, from www.jstor.org/stable/10.4169/j.ctt13x0ng0.31
Elran, Yossi. "Retrolife and The Pawns Neighbors." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 207-12. Mathematical Association of America, 2012. Accessed August 13, 2020. www.jstor.org/stable/10.4169/j.ctt13x0ng0.31.
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