Cite

Book of hours and missal, [circa 1390-1420].

MLA

Liturgy, Catholic Church., and ritual. Hours. Book of Hours and Missal, [circa 1390-1420]. 0AD. https://collections.library.yale.edu/catalog/10520306.

APA, 6th edition

Liturgy, C. C., & ritual. Hours. (0 C.E.). Book of hours and missal, [circa 1390-1420]. [Books of hours, Liturgy, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10520306.