MLA

Speculum Humane Salvationis, Etc. 0AD. https://collections.library.yale.edu/catalog/32497073.

APA, 6th edition

Speculum humane salvationis, etc. (0 C.E.). [Manuscripts, Medieval England 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/32497073.