Isaac I Comneno (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Isaac I Comneno" in Spanish language version.

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2books.google.com

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books.google.com

Wortley, 2010, pp. 455–456. Wortley, John, ed. (2010). John Skylitzes: A Synopsis of Byzantine History, 811–1057. Cambridge: Cambridge University Press. ISBN 978-0-521-76705-7.
Kaldellis, 2017, p. 219. Kaldellis, Anthony (2017). Streams of Gold, Rivers of Blood: The Rise and Fall of Byzantium, 955 A.D. to the First Crusade. New York: Oxford University Press. ISBN 978-0190253226.