Breviary (diurnal).
MLA
Breviary (Diurnal). 0AD. https://collections.library.yale.edu/catalog/10171935.
APA, 6th edition
Breviary (diurnal). (0 C.E.). [Manuscripts, Medieval Germany 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10171935.