ALLEN, John Romilly. Report on the Photography of the Sculptured Stones earlier than A.D. 1100, in the District of Scotland south of the river Dee; obtained under the Jubilee Gift of His Excellency Dr. R. H. Gunning, LL.D., F.S.A. Scot. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 31, p. 147–152, 1897. DOI: 10.9750/PSAS.031.147.152. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6658. Acesso em: 2 may. 2024.