MLA

Cicero, Marcus Tullius. De Senectute. 1467. https://collections.library.yale.edu/catalog/2013991.

APA, 6th edition

Cicero, M. T. (1467). De senectute [Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2013991.