MLA

Unidentified Chronicle of Venetian History (Fragment). 15AD. https://collections.library.yale.edu/catalog/10543836.

APA, 6th edition

Unidentified chronicle of Venetian history (fragment). (15 C.E.). [Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10543836.