Piotr z Colonny (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Piotr z Colonny" in Polish language version.

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archive.org

Ferdinand Gregorovius: History of the City of Rome in the Middle Ages. T. IV. Londyn: George Bell & Sons, 1896, s. 319–320. (ang.).
Ferdinand Gregorovius: History of the City of Rome in the Middle Ages. T. IV. Londyn: George Bell & Sons, 1896, s. 326–327. (ang.).

web.archive.org

Pietro della Columna. Genealogie Mittelalter. [dostęp 2013-01-08]. (niem.).