BIRLEY, Eric; RICHMOND, Ian A; STANFIELD, J A; HEDLEY, W Percy. Excavations at Birrens, 1936-37. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 72, p. 275–347, 1938. DOI: 10.9750/PSAS.072.275.347. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8073. Acesso em: 26 apr. 2024.