Drummond, J. 1869. Notes made during a wandering in the West Highlands; with Remarks upon the Style of Art of some Monumental Stones at Iona, and in other Localities. Proceedings of the Society of Antiquaries of Scotland. 8, (Nov. 1869), 117–120. DOI:https://doi.org/10.9750/PSAS.008.117.120.