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Published online by Cambridge University Press: 26 July 2017
1. The Frankish Church and the Carolingian Reforms 789-895(1977) ; The Frankish Kingdom under the Carolingians 751-987 (1983) ; l'auteur annonce la publication d'un recueil d'articles : The Uses of Literacy in Early Medieval Europe,1990.
2. From Memory to Written Record. 1066- 1307,Londres, 1979