The Catstane. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 105, p. 183–188, 1975. DOI: 10.9750/PSAS.105.183.188. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8880. Acesso em: 6 dec. 2025.