Sigrand

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