APA (7th ed.) Citation

Gregor IX. Archivmaterialien zu Gregor IX. (Papst), 1170-1241.

Chicago Style (17th ed.) Citation

Gregor IX. Archivmaterialien Zu Gregor IX. (Papst), 1170-1241.

MLA (9th ed.) Citation

Gregor IX. Archivmaterialien Zu Gregor IX. (Papst), 1170-1241.

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