Lockhart, W. 1892. Notices of Ethelred, Earl of Fife, and Abbot of Dunkeld, and his place in the Royal Family of Scotland in the Eleventh Century. Proceedings of the Society of Antiquaries of Scotland. 26, (Nov. 1892), 104–113. DOI:https://doi.org/10.9750/PSAS.026.104.113.