Krahn, Cornelius. "Penner, Johannes K. (1850-1926)." Global Anabaptist Mennonite Encyclopedia Online. 1959. Web. 25 Apr 2019. http://gameo.org/index.php?title=Penner,_Johannes_K._(1850-1926)&oldid=76952.
Krahn, Cornelius. (1959). Penner, Johannes K. (1850-1926). Global Anabaptist Mennonite Encyclopedia Online. Retrieved 25 April 2019, from http://gameo.org/index.php?title=Penner,_Johannes_K._(1850-1926)&oldid=76952.