變更

* {{cite book |url=https://archive.org/details/livesofpopesinea04mannuoft |title=The Lives of the Popes in the Early Middle Ages |last=Mann |first=Horace K. |year=1910 |publisher=Kegan Paul, Trench, Truebner, & Co. Ltd |location=London |oclc=499626370}}

* {{cite book |url=https://books.google.co.uk/books?id=yvXeCQAAQBAJ&pg=PA68 |title=The Deaths of the Popes |last=Reardon |first=Wendy J. |publisher=McFarland & Co. |location=Jefferson, North Carolina |year=2004 |isbn=978-0-7864-6116-5}}

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