BIRLEY, Eric. Marcus Cocceius Firmus: An epigraphic study. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 70, p. 363–377, 1936. DOI: 10.9750/PSAS.070.363.377. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7987. Acesso em: 5 may. 2024.