Southesk, E. of (1886) “The Oghams on the Brodie and Aquhollie Stones, with Notes on the Inscriptions of the Golspie and Newton Stones, and a List of the Oghams in Scotland”, Proceedings of the Society of Antiquaries of Scotland, 20, pp. 14–40. doi: 10.9750/PSAS.020.14.40.