MLA

Isocrates, Sylvanus, and Georgius. Epistolae, Quae Extant, Novem Cum Scholiis ... Latine Redduntur ... Studio & Opera Georg. Sylvani ... J. Heptinatall, 1685. https://collections.library.yale.edu/catalog/2057363.

APA, 6th edition

Isocrates, S., & G. (1685). Epistolae, quae extant, novem cum scholiis ... latine redduntur ... studio & opera Georg. Sylvani ... [Historiography]. J. Heptinatall. https://collections.library.yale.edu/catalog/2057363.