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Gerberding, Richard A., The Rise of the Carolingians and the Liber Hisgtoriae Francorum, Oxford University Press, 1987

Claussen, M. A., The Reform of the Frankish Church: Chrodegang of Metz and the Regula Canonicorum in the Eighth Century, Cambridge University Press, 2004

Medieval Lands Project, Family of Enguerrand, Comte de Paris