Clerk, D. and Stuart, J. (1876) “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, 11, pp. 468–469. doi: 10.9750/PSAS.011.468.469.