ADAMSON, Helen C; GALLAGHER, Dennis B. The Roman fort at Bertha, the 1973 excavation. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 116, p. 195–204, 1987. DOI: 10.9750/PSAS.116.195.204. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9266. Acesso em: 4 may. 2024.