Jelaskan Catatan dari Bernat dari Septimania

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

Thomassy, R. "Critique des deux chartes de foundation de l'abbaye de Saint-Guillem-du-Désert," Bibliothèque de l'Ecole des Chartes, Series 1, Volume II (Paris, 1840–1844).

Hummer, Hans J. Politics and Power in Early Medieval Europe: Alsace and the Frankish Realm 600 – 1000. Cambridge University Press: 2005.

Flodoard. Historia Remensis Ecclesiæ'''. III, XXVI, MGH SS XXXVI.

Thegan of Trier. Gesta Hludowici. 36, MGH SS II, p. 597.

Annales Xantenses. MGH SS II, p. 227.

Annales Fuldenses (Gesta quorundam regum Francorum), ed. G.H. Pertz, Annales et chronica aevi Carolini''. MGH Scriptores 1. Hanover, 1826. 337-415.