MLA
Luther, Martin, 1483-1546. Eyn Sermon von der Betrachtu[n]g des Heyligen Leydens Christi. XXXX. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/740ksn03qr-cor.
APA, 6th edition
Luther, Martin, 1483-1546. (XXXX)[Eyn Sermon von der Betrachtu[n]g des Heyligen Leydens Christi]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/740ksn03qr-cor.
Chicago
Luther, Martin, 1483-1546, Eyn Sermon von der Betrachtu[n]g des Heyligen Leydens Christi, XXXX, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/740ksn03qr-cor.