APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Cyril, Saint, Philip R. Amidon, and John J. O'Keefe. Festal Letters 13-30. Washington, D.C.: Catholic University of America Press, 2013.

MLA (9th ed.) Citation

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