Smith, D. (1906). Article 5: Quaternions and Ausdehnungslehre. History of Modern Mathematics (Lit2Go Edition). Retrieved January 09, 2025, from https://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1730/article-5-quaternions-and-ausdehnungslehre/
Smith, David Eugene. "Article 5: Quaternions and Ausdehnungslehre." History of Modern Mathematics. Lit2Go Edition. 1906. Web. <https://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1730/article-5-quaternions-and-ausdehnungslehre/>. January 09, 2025.
David Eugene Smith, "Article 5: Quaternions and Ausdehnungslehre," History of Modern Mathematics, Lit2Go Edition, (1906), accessed January 09, 2025, https://etc.usf.edu/lit2go/103/history-of-modern-mathematics/1730/article-5-quaternions-and-ausdehnungslehre/.