YOUNG, Alison. Brochs and Duns. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 95, p. 171–198, 1964. DOI: 10.9750/PSAS.095.171.198. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8627. Acesso em: 2 may. 2024.