“Points in the Plane.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. 39–50, www.jstor.org/stable/10.4169/j.ctt6wpwnz.7. Accessed 14 June 2021.
Alsina, C., & Nelsen, R. (2010). Points in the Plane. In Charming Proofs: A Journey into Elegant Mathematics (pp. 39-50). Mathematical Association of America. Retrieved June 14, 2021, from http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.7
Alsina, Claudi, and Roger B. Nelsen. "Points in the Plane." In Charming Proofs: A Journey into Elegant Mathematics, 39-50. Mathematical Association of America, 2010. Accessed June 14, 2021. http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.7.
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