DUNBAR, John G. Angus Graham. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 111, p. 1–6, 1982. DOI: 10.9750/PSAS.111.1.6. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9052. Acesso em: 1 may. 2024.