References for Alfonso Duque, Infante de Castilla * de Molina * de León

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W.K. v.Isenburg: Europäische Stammtafeln, Band II, Tafel 47. Marburg, 1953 (1965)
L. de Salazar y Castro: Indice de las Glorias de Farnese. Madrid, 1716
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.#
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 63. Marburg, 1984
D.Schwennicke: Europäische Stammtafeln, Vol. III/1, Tafel 127. Marburg, 1984
S.de Vajay: From Alfonso VII to Alfonso X - The first two Centuries of the Burgundian Dynasty in Castile and Leon. 1989