FOTHERINGHAME, W H. On the Thule of the Ancients. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 3, p. 491–503, 1862. DOI: 10.9750/PSAS.003.491.503. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/4549. Acesso em: 2 may. 2024.