Martin Luther (1838). “A Commentary on Saint Paul's Epistle to the Galatians: To which is Prefixed, The Life of the Author, and a Complete and Impartial History of the Times in which He Lived”, p.387
Martin Luther (1931). “Early Protestant Educators: The Educational Writings of Martin Luther, John Calvin, and Other Leaders of Protestant Thought”, Ams PressInc
Martin Luther, Henry Bell (Captain.), Joseph KERBY, Anton Lauterbach (1818). “The Familiar Discourses of Dr. Martin Luther ... Translated ... by Captain Henry Bell ... A New Edition, Revised ... by J. Kerby, Etc”, p.60