Lavater, Hans Rudolf. “Regnum Christi Etiam Externum - Huldrych Zwinglis Brief Vom 4. Mai 1528 an Ambrosius Blarer in Konstanz”. Zwingliana 15, no. 5 (January 1, 2010): 338–381. Accessed January 24, 2022. https://zwingliana.ch/index.php/zwa/article/view/813.