HANSON, William S; FRIELL, J G P. Westerton: a Roman watchtower on the Gask frontier. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 125, p. 499–519, 1996. DOI: 10.9750/PSAS.125.499.519. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9895. Acesso em: 7 may. 2024.