“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”, PSAS, vol. 9, pp. 292–296, Nov. 1871, doi: 10.9750/PSAS.009.292.296.