MLA

Psalter, Etc. 0AD. https://collections.library.yale.edu/catalog/10269842.

APA, 6th edition

Psalter, etc. (0 C.E.). [Prayers and devotions, Early works to 1800, Psalters, Manuscripts, Medieval England 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10269842.