Coba jelasin Lihat pula dari Ramnulf II dari Poitiers dong

Lewis, Archibald Ross. The Development of Southern French and Catalan Society, 718–1050. University of Texas Press: Austin, 1965.

MacLean, Simon. Kingship and Politics in the Late Ninth Century: Charles the Fat and the end of the Carolingian Empire. Cambridge University Press: 2003.