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* [http://www.newadvent.org/cathen/12272b.htm Catholic Encyclopedia - The List of Popes]
* [http://www.orthodoxengland.btinternet.co.uk/ortpopes.htm The Holy Orthodox Popes of Rome]
* Claudio Pendina Rendina - ''Papii. Istorie şi secrete'', Ed. BIC ALL, Bucureşti, 2003. ISBN: 973-571-410-8