“Additional Theorems, Problems, and Proofs.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. 209–238, www.jstor.org/stable/10.4169/j.ctt6wpwnz.16. Accessed 20 Jan. 2021.
Alsina, C., & Nelsen, R. (2010). Additional Theorems, Problems, and Proofs. In Charming Proofs: A Journey into Elegant Mathematics (pp. 209-238). Mathematical Association of America. Retrieved January 20, 2021, from http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.16
Alsina, Claudi, and Roger B. Nelsen. "Additional Theorems, Problems, and Proofs." In Charming Proofs: A Journey into Elegant Mathematics, 209-38. Mathematical Association of America, 2010. Accessed January 20, 2021. http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.16.
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