Why did the Romans fail to conquer Scotland?. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 118, p. 3–22, 1989. DOI: 10.9750/PSAS.118.3.22. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/9319. Acesso em: 1 oct. 2025.