References for Pedro Marchese, Conte de Guevara * del Vasto * di Ariano e Apici
J.W. v.Imhof:
Genealogiæ Viginti Illustrium In Hispania Familiarum.
Leipzig, 1712
D.Schwennicke:
Europäische Stammtafeln, Vol. III/4, Tafel 750.
Marburg, 1989