MLA

Zacchi, Gaspare. Bononiensium Res Publica. 1471. https://collections.library.yale.edu/catalog/9998961.

APA, 6th edition

Zacchi, G. (1471). Bononiensium res publica [Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/9998961.