MLA

William, of Melitona. Commentarius in Ecclesiasticum. 0AD. https://collections.library.yale.edu/catalog/10269815.

APA, 6th edition

William, of M. (0 C.E.). Commentarius in Ecclesiasticum [Commentaries, Manuscripts, Medieval France 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10269815.