MACKAY, James. Notice of the Excavation of the Broch at Ousdale, Caithness. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 26, p. 351–357, 1892. DOI: 10.9750/PSAS.026.351.357. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6486. Acesso em: 23 apr. 2024.