MLA
Heyden, Sebald, -1561, author. Catechistica summula religionis Christianae,. XXXX. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/3311ns1sm1-cor.
APA, 6th edition
Heyden, Sebald, -1561, author. (XXXX)[Catechistica summula religionis Christianae,]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/3311ns1sm1-cor.
Chicago
Heyden, Sebald, -1561, author, Catechistica summula religionis Christianae,, XXXX, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/3311ns1sm1-cor.