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Prof. Dáibhí Ó Cróinín, Department of History, NUI Galway, ‘Rath Melsigi, Willibrord and the Earliest Echternach Manuscripts’, Peritia, Vol. 3 (1984) pp. 17–49.

J. Story, 'Bede, Willibrord and the Letters of Pope Honorius on the genesis of the archbishopric of York', English Historical Review cxxvii (527) (2012), 783-818 (doi: https://doi.org/10.1093/ehr/ces142)