(EN) Nelson, Janet L., Courts, elites, and gendered power in the early Middle Ages Charlemagne and others, Ashgate, 2007, ISBN9780754659334, OCLC1039829293.
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(EN) Einhard, approximately 770-840, Two lives of Charlemagne, Ganz, David,, Notker, Balbulus, approximately 840-912, Londra, 30 settembre 2008, ISBN9780140455052, OCLC226280161.
