1. Bede,History of the English Church and People, trans. by Leo Sherley-Price (Harmondsworth: Penguin, 1955)
2. Breuiarium Aberdonense(London: Bannatyne Club: 1854)
3. Calendar of Papal Registers Relating to Great Britain and Ireland,v:1398–1404, ed. by W. H. Bliss and J. A. Twemlow (London: HMSO, 1904)
4. The Calendar of St Willibrord from MS Paris Lat. 10837: A Facsimile, ed. by H. A. Wilson (London: Harrison, 1918)