MLA

Meghen, Peter, and scribe. [Moral and Theological Treatises Copied for Christopher Urswick]. 1502. https://collections.library.yale.edu/catalog/11394881.

APA, 6th edition

Meghen, P., & scribe. (1502). [Moral and theological treatises copied for Christopher Urswick]. [Early works to 1800, Manuscripts, Medieval England 16th century, Manuscripts, Renaissance England 16th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11394881.