Ritter, A. (1857). History of the Moravian Church in Philadelphia: From its foundation in 1742 to the present time : comprising notices, defensive of its founder and patron, Count Nicholas Ludwig von Zinzendorff : together with an appendix. Philadelphia: Hayes & Zell.

Ritter, Abraham. History of the Moravian Church in Philadelphia: From Its Foundation in 1742 to the Present Time : Comprising Notices, Defensive of Its Founder and Patron, Count Nicholas Ludwig Von Zinzendorff : Together With an Appendix. Philadelphia: Hayes & Zell, 1857.

Ritter, Abraham. History of the Moravian Church in Philadelphia: From Its Foundation in 1742 to the Present Time : Comprising Notices, Defensive of Its Founder and Patron, Count Nicholas Ludwig Von Zinzendorff : Together With an Appendix. Philadelphia: Hayes & Zell, 1857.