MLA

Jerome, Saint, d. 419 or 20, Rufinus, of Aquileia, 345-410. Dialogus contra Pelagianos, etc.. [ca. 1430-40]. https://collections.library.yale.edu/catalog/11403208.

APA, 6th edition

Jerome, Saint, d. 419 or 20, & Rufinus, of Aquileia, 345-410. ([ca. 1430-40])[Dialogus contra Pelagianos, etc.]. https://collections.library.yale.edu/catalog/11403208.