== Eksterne henvisninger ==
*[[Janet Nelson|Nelson, Janet L]] (ed.), and [[Timothy Reuter|Reuter, Timothy]] (trans.) ''[https://books.google.com/books?id=ARENAQAAIAAJ The Annals of Fulda]''. (Manchester Medieval series, Ninth-Century Histories, Volume II.) Manchester: Manchester University Press, 1992.
*{{citation|author=Simon Coupland |title=From poachers to gamekeepers: Scandinavian warlords and Carolingian kings |doi=10.1111/1468-0254.00019 |journal=Early Medieval Europe |year=1998 |volume=7 |pages=85–114}}
*MacLean, Simon. ''Kingship and Politics in the Late Ninth Century: Charles the Fat and the end of the Carolingian Empire''. Cambridge University Press: 2003.
*Smith, Julia M. H. ''Province and Empire: Brittany and the Carolingians''. Cambridge University Press: 1992.
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