Ryan, Michael (1990). "The Formal Relationships of Insular Early Medieval Eucharistic Chalices". Proceedings of the Royal Irish Academy: Archaeology, Culture, History, Literature. 90: 281–356. JSTOR25516070.
Nelson, Janet L. (Janet Laughland), 1942- (2007). Courts, elites, and gendered power in the early Middle Ages : Charlemagne and others. Aldershot, Hants, England: Ashgate. ISBN9780754659334. OCLC77004241.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
Hammer, Carl I. (2007). From ducatus to regnum : ruling Bavaria under the Merovingians and early Carolingians. Turnhout, Belgium: Brepols. pp. 192, 195. ISBN978-2-503-52582-2. OCLC181142213.
Hammer, Carl I. (2007). From ducatus to regnum : ruling Bavaria under the Merovingians and early Carolingians. Turnhout, Belgium: Brepols. p. 192. ISBN978-2-503-52582-2. OCLC181142213.
