Epistulae et tractatus
MLA
Ambrose, Saint, Bishop of Milan, d. 397, Jerome, Saint, d. 419 or 20. Epistulae et tractatus. 1439-1440.. https://collections.library.yale.edu/catalog/10929364.
APA, 6th edition
Ambrose, Saint, Bishop of Milan, d. 397, & Jerome, Saint, d. 419 or 20. (1439-1440.)[Epistulae et tractatus]. https://collections.library.yale.edu/catalog/10929364.