APA (7th ed.) Citation

Grisar, H., & Grisar, H. (1908). Bulle Gregors IX.

Chicago Style (17th ed.) Citation

Grisar, Hartmann, and Hartmann Grisar. Bulle Gregors IX. 1908.

MLA (9th ed.) Citation

Grisar, Hartmann, and Hartmann Grisar. Bulle Gregors IX. 1908.

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