Matengenezo ya Kiprotestanti
Luther, Martin Luther's Correspondence and Other Contemporary Letters, 2 vols., tr. and ed. by Preserved Smith, Charles Michael Jacobs, The Lutheran Publication Society, Philadelphia, Pa. 1913, 1918. vol.2 (1521–1530) from Google Books. Reprint of Vol.1, Wipf & Stock Publishers (March 2006). ISBN 1-59752-601-0.