“The Classical Triangle Centers.” Exploring Advanced Euclidean Geometry with GeoGebra, by Gerard A. Venema, 1st ed., Mathematical Association of America, 2013, pp. 23–30, www.jstor.org/stable/10.4169/j.ctt5hh9ht.6. Accessed 2 Aug. 2021.
Venema, G. (2013). The Classical Triangle Centers. In Exploring Advanced Euclidean Geometry with GeoGebra (pp. 23-30). Mathematical Association of America. Retrieved August 2, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9ht.6
Venema, Gerard A. "The Classical Triangle Centers." In Exploring Advanced Euclidean Geometry with GeoGebra, 23-30. Mathematical Association of America, 2013. Accessed August 2, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9ht.6.
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