MLA

Vaticinia Pontificum, Etc. 0AD. https://collections.library.yale.edu/catalog/2021601.

APA, 6th edition

Vaticinia Pontificum, etc. (0 C.E.). [Early works to 1800, Manuscripts, Medieval Germany 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2021601.