Clerk, Duncan, and John Stuart. “Notes of an Urn Found in a Cist in a Gravel Hillock Near Oban (in a Letter to the Secretary) With Notice of the so-Called Serpent-Mound of Lochnell”. Proceedings of the Society of Antiquaries of Scotland, vol. 11, Nov. 1876, pp. 468-9, doi:10.9750/PSAS.011.468.469.