MLA

Michael, of Hungary. XIII Sermones, Etc. 0AD. https://collections.library.yale.edu/catalog/9998928.

APA, 6th edition

Michael, of H. (0 C.E.). XIII sermones, etc [Early works to 1800, Manuscripts, Medieval England 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/9998928.