MLA

Galen. Opera Varia. 0AD. https://collections.library.yale.edu/catalog/2111169.

APA, 6th edition

G. (0 C.E.). Opera varia [Manuscripts, Medieval Byzantine Empire 14th century, Manuscripts, Medieval Italy 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2111169.