ASHMORE, Patrick J. Neolithic carvings in Maes Howe. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 116, p. 57–62, 1987. DOI: 10.9750/PSAS.116.57.62. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9257. Acesso em: 26 apr. 2024.