MLA

Origen. De Engastrimytho, Etc. 0AD. https://collections.library.yale.edu/catalog/17280350.

APA, 6th edition

O. (0 C.E.). De engastrimytho, etc [Manuscripts, Renaissance Italy 16th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/17280350.