ALLEN, John Romilly. Report on the Sculptured Stones older than A.D. 1100, with Symbols and Celtic Ornament, in the District of Scotland, North of the River Dee; obtained under the Victoria Jubilee Gift of His Excellency Dr. R. H. Gunning, F.S.A. Scot. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 25, p. 422–431, 1891. DOI: 10.9750/PSAS.025.422.431. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6411. Acesso em: 29 apr. 2024.