MLA

Ferial Psalter and Hymnal. 0AD. https://collections.library.yale.edu/catalog/2006582.

APA, 6th edition

Ferial psalter and hymnal. (0 C.E.). [Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2006582.