Beasley, John D. “Magic Knight’s Tours.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 153–158, www.jstor.org/stable/10.4169/j.ctt13x0ng0.23. Accessed 7 Mar. 2021.
Beasley, J. (2012). Magic Knight’s Tours. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 153-158). Mathematical Association of America. Retrieved March 7, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.23
Beasley, John D. "Magic Knight’s Tours." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 153-58. Mathematical Association of America, 2012. Accessed March 7, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.23.
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