Гвидо III Сполето — разлика између измена

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== Извори ==
* di Carpegna Falconieri, Tommaso. ''Guido di Spoleto''. ''Dizionario Biografico degli Italiani'', LXI. Rome: (2003). стр. 354–361.
* {{citationcite book | ref = harv |last=Canduci| first = Alexander | title =Triumph & Tragedy: The Rise and Fall of Rome's Immortal Emperors | publisher = Pier 9 |year=2010|isbn=978-1-74196-598-8}}
* Mann, Horace, K. ''The Lives of the Popes in the Early Middle Ages, Vol III: The Popes During the Carolingian Empire, 858-891''. 1925
* Mann, Horace, K. ''The Lives of the Popes in the Early Middle Ages, Vol IV: The Popes in the Days of Feudal Anarchy, 891-999''. 1925
1.572.075

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