APA (7th ed.) Citation

Robertus comes Flandriae. Epistula ad Robertum filium. Brepols Publishers.

Chicago Style (17th ed.) Citation

Robertus comes Flandriae. Epistula Ad Robertum Filium. Turnhout: Brepols Publishers.

MLA (9th ed.) Citation

Robertus comes Flandriae. Epistula Ad Robertum Filium. Brepols Publishers.

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