Tolong jelaskan mengenai Catatan dari Claudio Sánchez-Albornoz

José Luis Gómez Martínez, "Américo Castro y Sánchez-Albornoz:  Dos posiciones ante el origen de los españoles." Nueva Revista de Filología Hispánica  21 (1972):  301-320.

James F. Powers, "Claudio Sánchez-Albornoz y Menduiña," in Medieval Scholarship: Biographical Studies on the Formation of a Discipline, vol. 1, ed. Helen Daimico & Joseph B. Zavadil (New York, 1995), 233–246.

Luis G. de Valdevellano, "Don Claudio Sánchez-Albornoz y Menduiña," Boletin de la Real Academia de la Historia 181 (1984):337–45.

Peter Linehan, "A History of Isolation," Times Literary Supplement, 11 October 1985, 1144.

Fundación Claudio Sanchez-Albornoz biography  (in Spanish)