MLA

Gallicanus, Eusebius. De Corpore Christi, Etc. 0AD. https://collections.library.yale.edu/catalog/16046889.

APA, 6th edition

Gallicanus, E. (0 C.E.). De corpore christi, etc [Early works to 1800, Manuscripts, Medieval England 12th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/16046889.