HUNTER, Douglas Gordon. Notice of an Ancient Fort at Greenford, near Arbroath. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 44, p. 112–117, 1910. DOI: 10.9750/PSAS.044.112.117. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7176. Acesso em: 26 apr. 2024.