The First Sermon on the Day of the Visitation of Mary (Die erste Predigt am Tag der Heimsuchung Mariä). (1532).

Denifle, Heinrich, Luther and Lutherdom, vol.1, part 1, tr. from 2nd rev. ed. of German by Raymund Volz, Somerset, England: Torch Press, 1917, (Cornell University Library 2009), ISBN 1112168176 ISBN 9781112168178, p. 305. Denifle cites Luther’s Sämtliche Werke (Vols 4-6 in 1), Erlangen-Frankfurt edition, 1865, Heyder & Zimmer, vol. vi, p. 401