BRYDALL, Robert. Notice of a Carved Stone at Crail, Fifeshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 33, p. 53–54, 1899. DOI: 10.9750/PSAS.033.53.54. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6726. Acesso em: 5 may. 2024.