Henry Frank Eshleman (1917). Historic Background and Annals of the Swiss and German Pioneer Settlers of Southeastern Eastern Pennsylvania, and of Their ReMote Ancestors, from the Middle, of the Dark Ages, Down to the Time of the Reva War. London: Forgotten Books (reprint), 2013, p. 5. Online text: scan B.
veritasseminary.com
John C. L. Gieseler (1855). A Textbook Of Church History, vol. 3. New York: Harper and Brothers, 1858, tr. John W. Hull, p. 174, footnote 8, where he cites Justinger's Bernese Chronicle.
