MLA

Ars Moriendi, Etc. 0AD. https://collections.library.yale.edu/catalog/2065320.

APA, 6th edition

Ars moriendi, etc. (0 C.E.). [Manuscripts, Medieval Germany 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2065320.