Smith, R Angus. “Descriptive List of Antiquities Near Loch Etive, Argyllshire, Consisting of Vitrified Forts, Cairns, Circles, Crannogs, &c.; With Some Remarks on the Growth of Peat”. Proceedings of the Society of Antiquaries of Scotland, vol. 9, Nov. 1872, pp. 81-106, doi:10.9750/PSAS.009.81.106.