APA (7th ed.) Citation

Grisar, H. (1904). San Gregorio Magno (590-604). Desclée, Lefebvre.

Chicago Style (17th ed.) Citation

Grisar, Hartmann. San Gregorio Magno (590-604). Roma: Desclée, Lefebvre, 1904.

MLA (9th ed.) Citation

Grisar, Hartmann. San Gregorio Magno (590-604). Desclée, Lefebvre, 1904.

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