MLA

Cicero, Marcus Tullius. De Divinatione. 1456. https://collections.library.yale.edu/catalog/2057502.

APA, 6th edition

Cicero, M. T. (1456). De divinatione [Early works to 1800, Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2057502.