MLA
Luther, Martin, 1483-1546. Disputatio inter Egregios & praelatus virus ac doctores, Joannem Ecci[um] & Martinum Lutherum in p[rae]sentia notariorum habita.. 1519. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/52259zw4g1-cor.
APA, 6th edition
Luther, Martin, 1483-1546. (1519)[Disputatio inter Egregios & praelatus virus ac doctores, Joannem Ecci[um] & Martinum Lutherum in p[rae]sentia notariorum habita.]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/52259zw4g1-cor.
Chicago
Luther, Martin, 1483-1546, Disputatio inter Egregios & praelatus virus ac doctores, Joannem Ecci[um] & Martinum Lutherum in p[rae]sentia notariorum habita., 1519, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/52259zw4g1-cor.