“What Do You Think?: A Sampler.” Sink or Float?: Thought Problems in Math and Physics, by Keith Kendig, 1st ed., vol. 33, Mathematical Association of America, 2008, pp. 1–8, www.jstor.org/stable/10.4169/j.ctt6wpwdk.4. Accessed 6 Aug. 2020.
Kendig, K. (2008). What Do You Think?: A Sampler. In Sink or Float?: Thought Problems in Math and Physics (pp. 1-8). Mathematical Association of America. Retrieved August 6, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpwdk.4
Kendig, Keith. "What Do You Think?: A Sampler." In Sink or Float?: Thought Problems in Math and Physics, 1-8. Mathematical Association of America, 2008. Accessed August 6, 2020. www.jstor.org/stable/10.4169/j.ctt6wpwdk.4.
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