Book of hours : use of Sarum.
MLA
Church., Catholic. Book of Hours : Use of Sarum. 0AD. https://collections.library.yale.edu/catalog/16371268.
APA, 6th edition
Church., C. (0 C.E.). Book of hours : use of Sarum. [Decorated initials, Inhabited initials, Manuscripts, Medieval--England--15th century.]. https://collections.library.yale.edu/catalog/16371268.