“Preface.” Sink or Float?: Thought Problems in Math and Physics, by Keith Kendig, 1st ed., vol. 33, Mathematical Association of America, 2008, pp. vii-xii, www.jstor.org/stable/10.4169/j.ctt6wpwdk.2. Accessed 12 May 2021.
Kendig, K. (2008). Preface. In Sink or Float?: Thought Problems in Math and Physics (pp. Vii-Xii). Mathematical Association of America. Retrieved May 12, 2021, from http://www.jstor.org/stable/10.4169/j.ctt6wpwdk.2
Kendig, Keith. "Preface." In Sink or Float?: Thought Problems in Math and Physics, Vii-Xii. Mathematical Association of America, 2008. Accessed May 12, 2021. http://www.jstor.org/stable/10.4169/j.ctt6wpwdk.2.
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