Sources
- di Carpegna Falconieri, Tommaso. Guido di Spoleto. Dizionario Biografico degli Italiani, LXI. Rome: 2003, pp. 354–361.
- Canduci, Alexander (2010), Triumph & Tragedy: The Rise and Fall of Rome's Immortal Emperors, Pier 9, 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
- Comyn, Robert. History of the Western Empire, from its Restoration by Charlemagne to the Accession of Charles V, Vol. I. 1851
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