FEACHEM, Richard W. The Fortifications on Traprain Law. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 89, p. 284–289, 1958. DOI: 10.9750/PSAS.089.284.289. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8495. Acesso em: 25 apr. 2024.