Smith, D. (1906). Article 17: Elementary Geometry. *History of Modern Mathematics* (Lit2Go Edition). Retrieved October 23, 2016, from http://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1742/article-17-elementary-geometry/

Smith, David Eugene. "Article 17: Elementary Geometry." *History of Modern Mathematics*. Lit2Go Edition. 1906. Web. <http://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1742/article-17-elementary-geometry/>. October 23, 2016.

David Eugene Smith, "Article 17: Elementary Geometry," *History of Modern Mathematics*, Lit2Go Edition, (1906), accessed October 23, 2016, http://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1742/article-17-elementary-geometry/.