MLA

Pseudo-Bede. Commentarius in Psalmos. 0AD. https://collections.library.yale.edu/catalog/2020351.

APA, 6th edition

P.-B. (0 C.E.). Commentarius in Psalmos [Commentaries, Manuscripts, Medieval Italy 12th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2020351.