“A Treasury of Triangle Theorems.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. 71–90, www.jstor.org/stable/10.4169/j.ctt6wpwnz.9. Accessed 13 June 2021.
Alsina, C., & Nelsen, R. (2010). A Treasury of Triangle Theorems. In Charming Proofs: A Journey into Elegant Mathematics (pp. 71-90). Mathematical Association of America. Retrieved June 13, 2021, from http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.9
Alsina, Claudi, and Roger B. Nelsen. "A Treasury of Triangle Theorems." In Charming Proofs: A Journey into Elegant Mathematics, 71-90. Mathematical Association of America, 2010. Accessed June 13, 2021. http://www.jstor.org/stable/10.4169/j.ctt6wpwnz.9.
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