References for Conde Don Pedro Gonzáles de Lara

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E. Brandenburg: Die Nachkommen Karls des Grossen. Leipzig 1936, Frankfurt 1964
J.W. v.Imhof: Genealogiæ Viginti Illustrium In Hispania Familiarum. Leipzig, 1712
L. de Salazar y Castro: Historia Genealogica de la Casa de Lara. Madrid, 1696, Vol1, p.#
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966
S.de Vajay: From Alfonso VII to Alfonso X - The first two Centuries of the Burgundian Dynasty in Castile and Leon. 1989