MLA

Brut Chronicle, Etc. 0AD. https://collections.library.yale.edu/catalog/17480197.

APA, 6th edition

Brut chronicle, etc. (0 C.E.). [Manuscripts, Medieval England 14th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/17480197.