MLA

Rudimenta Grammatices; Disticha Catonis. 0AD. https://collections.library.yale.edu/catalog/11403201.

APA, 6th edition

Rudimenta grammatices; Disticha Catonis. (0 C.E.). [Manuscripts, Medieval Italy 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11403201.