MORRIS, R W B; BAILEY, Douglas C. The cup-and-ring marks and similar sculptures of south-western Scotland: a survey. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 98, p. 150–172, 1967. DOI: 10.9750/PSAS.098.150.172. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8676. Acesso em: 25 nov. 2024.