Gardner, Martin. “L-Tromino Tiling of Mutilated Chessboards.” Martin Gardner in the Twenty-First Century, edited by Michael Henle and Brian Hopkins, 1st ed., Mathematical Association of America, 2012, pp. 127–134, www.jstor.org/stable/10.4169/j.ctt13x0ng0.20. Accessed 27 Feb. 2021.
Gardner, M. (2012). L-Tromino Tiling of Mutilated Chessboards. In Henle M. & Hopkins B. (Eds.), Martin Gardner in the Twenty-First Century (pp. 127-134). Mathematical Association of America. Retrieved February 27, 2021, from http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.20
Gardner, Martin. "L-Tromino Tiling of Mutilated Chessboards." In Martin Gardner in the Twenty-First Century, edited by Henle Michael and Hopkins Brian, 127-34. Mathematical Association of America, 2012. Accessed February 27, 2021. http://www.jstor.org/stable/10.4169/j.ctt13x0ng0.20.
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