MLA

Antiphonary. 0AD. https://collections.library.yale.edu/catalog/9998911.

APA, 6th edition

Antiphonary. (0 C.E.). [Manuscripts, Medieval Germany 15th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/9998911.