APA (7th ed.) Citation

Gregori I, p., & Étaix, R. (1999). Homiliae in Evangelia. Brepols.

Chicago Style (17th ed.) Citation

Gregori I, papa, and R. Étaix. Homiliae in Evangelia. Turnhout: Brepols, 1999.

MLA (9th ed.) Citation

Gregori I, papa, and R. Étaix. Homiliae in Evangelia. Brepols, 1999.