APA (7th ed.) Citation

León I, P. (1874). S. Leonis Magni romani pontifici epistolae selectae. Libraria Academica Wagneriana [etc.].

Chicago Style (17th ed.) Citation

León I, Papa. S. Leonis Magni Romani Pontifici Epistolae Selectae. Oeniponti [etc.]: Libraria Academica Wagneriana [etc.], 1874.

MLA (9th ed.) Citation

León I, Papa. S. Leonis Magni Romani Pontifici Epistolae Selectae. Libraria Academica Wagneriana [etc.], 1874.

Warning: These citations may not always be 100% accurate.