Bibliografie
. Een onbekend Leven van Sint Vitus duikt op in Leeuwarden. Madoc. 2019;33(1):37-48.
. The Anglo-Saxon Continental Mission and the Transfer of Encyclopaedic Knowledge. In: . Foundations of Learning: The Transfer of Encyclopaedic Knowledge in the Early Middle Ages. Leuven: Peeters; 2007. pp. 19-50.
. The Anglo-Saxon Continental Mission and the Transfer of Encyclopaedic Knowledge. In: . Foundations of Learning: The Transfer of Encyclopaedic Knowledge in the Early Middle Ages. Leuven: Peeters; 2007. pp. 19-50.
. Lost but Not Forgotten: References to a Remarkable Middle Dutch "Legenda aurea" manuscript. In: . Signs on the edge: Space, text and margin in Medieval manuscripts. Leuven: Peeters; 2007. pp. 261-288.
. Footprints of Monastic Instruction: A Latin Psalter with Interverbal Old Frisian Glosses. In: . Signs on the edge: Space, text and margin in Medieval manuscripts . Leuven: Peeters; 2007. pp. 203-234.
. The Migration of Ideas in the Early Middle Ages: Ways and Means. In: . Foundations of Learning: The Transfer of Encyclopaedic Knowledge in the Early Middle Ages. Leuven: Peeters; 2007. pp. 1-18.
. It kleaster Anjum en syn oergong nei Windesheim. In: . Speculum Frisicum. Stùdzjes oanbean oan Philippus H. Breuker. Leeuwarden: Fryske Akademy; 2001. pp. 23-44.