Anderson, Joseph. “Notice of a Sculptured Stone With Ogham Inscription, from Latheron, Presented to the National Museum by Sir Francis Tress Barry, Bart., M.P. Hon. F.S.A. Scot., Keiss Castle, Caithness; And of Two Sculptured Stones, Recently Discovered by Rev. D. Macrae, B.D., at Edderton, Ross-Shire”. Proceedings of the Society of Antiquaries of Scotland, vol. 38, Nov. 1904, pp. 534-41, doi:10.9750/PSAS.038.534.541.