MLA
Luther, Martin, 1483-1546. Eyn Sermon von dem heyligen hochwirdigen Sacrame[n]t der Tauffe. XXXX. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8qc3-cor.
APA, 6th edition
Luther, Martin, 1483-1546. (XXXX)[Eyn Sermon von dem heyligen hochwirdigen Sacrame[n]t der Tauffe]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8qc3-cor.
Chicago
Luther, Martin, 1483-1546, Eyn Sermon von dem heyligen hochwirdigen Sacrame[n]t der Tauffe, XXXX, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/1741rn8qc3-cor.