APA (7th ed.) Citation

St. Cyril of Alexandria, Amidon, P. R. S., & O'Keefe, J. J. (2013). Festal letters 13-30. Catholic University of America Press.

Chicago Style (17th ed.) Citation

St. Cyril of Alexandria, Philip R. SJ Amidon, and John J. O'Keefe. Festal Letters 13-30. Washington, District of Columbia: Catholic University of America Press, 2013.

MLA (9th ed.) Citation

St. Cyril of Alexandria, et al. Festal Letters 13-30. Catholic University of America Press, 2013.