PETRIE, George; MITCHELL, Arthur. Notice of some Rude Stone Implements found in Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 7, p. 135–136, 1867. DOI: 10.9750/PSAS.007.135.136. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5319. Acesso em: 24 apr. 2024.