Ripley, George; Dana, Charles Anderson (1862). "Type". The new American cyclopaedia: a popular dictionary of general knowledge. Vol. 15. D. Appleton and Company. p. 690. Retrieved 19 November 2010.
Leaman, Hans. "Johann Christoph Sauer." In Immigrant Entrepreneurship: German-American Business Biographies, 1720 to the Present, vol. 1, edited by Marianne S. Wokeck. German Historical Institute. Last modified March 07, 2014.