MACKENZIE, W MacKay. Clay Castle-Building in Scotland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 68, p. 117–127, 1934. DOI: 10.9750/PSAS.068.117.127. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7908. Acesso em: 23 apr. 2024.