APA (7th ed.) Citation

Gregor, I., & Adriaen, M. (1985). S. Gregorii Magni opera. S. Gregorii Magni opera.

Chicago Style (17th ed.) Citation

Gregor, I., and Marcus Adriaen. "S. Gregorii Magni Opera." S. Gregorii Magni Opera 1985.

MLA (8th ed.) Citation

Gregor, I., and Marcus Adriaen. "S. Gregorii Magni Opera." S. Gregorii Magni Opera, 1985.

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