MLA

Commentary on the Doctrinale of Alexander De Villa Dei. 0AD. https://collections.library.yale.edu/catalog/2032617.

APA, 6th edition

Commentary on the Doctrinale of Alexander de Villa Dei. (0 C.E.). [Manuscripts, Medieval Italy 13th century, Manuscripts, Medieval Italy 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2032617.