MLA

Treatises on Orthography. 15AD. https://collections.library.yale.edu/catalog/10563088.

APA, 6th edition

Treatises on orthography. (15 C.E.). [Glossaries, vocabularies, etc, Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10563088.