References
- Barton, Simon. 1997. The Aristocracy in Twelfth-Century León and Castile. Cambridge: Cambridge University Press.
- Fletcher, Richard A. 1989. The Quest for El Cid. New York: Alfred A. Knopf.
- Reilly, Bernard F. 1988. The Kingdom of León-Castilla under King Alfonso VI, 1065–1109. Princeton: Princeton University Press.
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