MLA

Lectionary (Fragment). 0AD. https://collections.library.yale.edu/catalog/15947349.

APA, 6th edition

Lectionary (fragment). (0 C.E.). [Manuscripts, Medieval 12th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/15947349.