ALLEN, John Romilly. Notes on some Undescribed Stones with Cup-Markings in Scotland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 16, p. 79–143, 1882. DOI: 10.9750/PSAS.016.79.143. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6006. Acesso em: 2 may. 2024.