APA (7th ed.) Citation

Honorius III. Papst. Regesta Honorii Papae III. Olms.

Chicago Style (17th ed.) Citation

Honorius III. Papst. Regesta Honorii Papae III. Hildesheim [u.a.]: Olms.

MLA (9th ed.) Citation

Honorius III. Papst. Regesta Honorii Papae III. Olms.

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