“Quadrilaterals.” Exploring Advanced Euclidean Geometry with GeoGebra, by Gerard A. Venema, 1st ed., Mathematical Association of America, 2013, pp. 53–56, www.jstor.org/stable/10.4169/j.ctt5hh9ht.10. Accessed 4 Aug. 2021.
Venema, G. (2013). Quadrilaterals. In Exploring Advanced Euclidean Geometry with GeoGebra (pp. 53-56). Mathematical Association of America. Retrieved August 4, 2021, from http://www.jstor.org/stable/10.4169/j.ctt5hh9ht.10
Venema, Gerard A. "Quadrilaterals." In Exploring Advanced Euclidean Geometry with GeoGebra, 53-56. Mathematical Association of America, 2013. Accessed August 4, 2021. http://www.jstor.org/stable/10.4169/j.ctt5hh9ht.10.
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