MLA

Carthusian Psalter with Canticles and Creed. 0AD. https://collections.library.yale.edu/catalog/16162641.

APA, 6th edition

Carthusian Psalter with Canticles and Creed. (0 C.E.). [Early works to 1800, Manuscripts, Medieval Germany 16th century, Manuscripts, Renaissance Germany 16th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/16162641.