[d] Agobardus, Works (edited by Baluze).
[e] Johann G. A. Wirth, Geschichte der deutschen Staaten.
[f] M. E. Thalheimer, Mediæval and Modern History.
Chapter VII. The Birth of German Nationality
[b] Friedrich Wilhelm Benjamin von Giesebrecht, op. cit.
[c] Annales Fuldenses.
[d] Heinrich Gerdes, Geschichte des Deutschen Volkes.
[e] Wolfgang Menzel, History of Germany from the Earliest Period to the Present Time (translated from the German by G. Horrocks).
[f] Wittekind, Res gestæ Saxonicæ.