Anderson, Joseph. “Notes on the Excavation of ’Kenny’s Cairn,’ on the Hill of Bruan; Carn Righ, Year Yarhouse; the Warth Hill Cairn, Duncansbay; And Several Smaller Sepulchral Cairns in Caithness”. Proceedings of the Society of Antiquaries of Scotland, vol. 9, Nov. 1871, pp. 292-6, doi:10.9750/PSAS.009.292.296.