Vita Heinrici IV. imperatoris - Wattenbach, Wilhelm, 1819-1897.; Eberhardt, Wilhelm, 1867- (Impensis bibliopolii Hahniani, 1899)
Attribué à Otbertus, Bishop of Liège; Guido, presbyter; Erlung, Bishop of Würzburg; Godescalcus of Limburg; and Dietrich of Mainz.--cf. Praefatio