MLA

Essortatione Alli Principi Christiani Perche Prendano l'Armi Et Si Uniscano Contra Turchi. 0AD. https://collections.library.yale.edu/catalog/11007521.

APA, 6th edition

Essortatione alli principi Christiani perche prendano l'armi et si uniscano contra Turchi. (0 C.E.). [Manuscripts, Renaissance Italy 16th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11007521.