“ACKNOWLEDGMENTS.” Combinatorial Mathematics, by HERBERT JOHN RYSER, 1st ed., vol. 14, Mathematical Association of America, 1963, pp. xi-xii. JSTOR, www.jstor.org/stable/10.4169/j.ctt5hh8v6.3. Accessed 15 June 2021.
RYSER, H. (1963). ACKNOWLEDGMENTS. In Combinatorial Mathematics (pp. Xi-Xii). Mathematical Association of America. Retrieved June 15, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.3
RYSER, HERBERT JOHN. "ACKNOWLEDGMENTS." In Combinatorial Mathematics, Xi-Xii. Mathematical Association of America, 1963. Accessed June 15, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh8v6.3.
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