Otón I de Wittelsbach (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Otón I de Wittelsbach" in Spanish language version.

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archive.org

Freed, 1984, p. 9. Freed, John B. (1984). The Counts of Falkenstein: Noble Self-consciousness in Twelfth-century Germany. The American Philosophical Society. (requiere registro).