Gradual
MLA
Church, Catholic. Gradual. 0AD. https://collections.library.yale.edu/catalog/2037956.
APA, 6th edition
Church, C. (0 C.E.). Gradual [Hand coloring, Historiated initials, Illuminated manuscripts, Illustrations, Inhabited initials, Musical works]. https://collections.library.yale.edu/catalog/2037956.