APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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