MLA

Hours of the Virgin; Life of the Virgin; Description of the Pilgrim Churches in Rome. 0AD. https://collections.library.yale.edu/catalog/2056653.

APA, 6th edition

Hours of the Virgin; Life of the Virgin; Description of the pilgrim churches in Rome. (0 C.E.). [Prayers and devotions, Manuscripts, Medieval Germany 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2056653.