Coba jelasin Catatan dari Wilibrordus dong

Paul Dräger (ed.), Alkuin, Vita sancti Willibrordi; Das Leben des heiligen Willibrord (Trier: Kliomedia, 2008)

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)