MARTLEW, Roger. The typological study of the structures of the Scottish brochs. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 112, p. 254–276, 1983. DOI: 10.9750/PSAS.112.254.276. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9083. Acesso em: 5 may. 2024.