MLA
Luther, Martin, 1483-1546. Am. [sic] Sermon. zü sant Mychael getho[n] zu Erffordt auff den tag der aylff Tausent junckfrauwen vom glauben vnd wercken. XXXX. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/385n8pk1k9-cor.
APA, 6th edition
Luther, Martin, 1483-1546. (XXXX)[Am. [sic] Sermon. zü sant Mychael getho[n] zu Erffordt auff den tag der aylff Tausent junckfrauwen vom glauben vnd wercken]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/385n8pk1k9-cor.
Chicago
Luther, Martin, 1483-1546, Am. [sic] Sermon. zü sant Mychael getho[n] zu Erffordt auff den tag der aylff Tausent junckfrauwen vom glauben vnd wercken, XXXX, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/385n8pk1k9-cor.