MLA

Breviary, Catholic Church. Breviarium [?]. Albrecht Kunne, 0AD. https://collections.library.yale.edu/catalog/15825689.

APA, 6th edition

Breviary, C. C. (0 C.E.). Breviarium [?] [Incunabula, Printed waste (Binding)]. Albrecht Kunne, https://collections.library.yale.edu/catalog/15825689.