SIMPSON, W Douglas. Glenbervie and its castle. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 105, p. 255–261, 1975. DOI: 10.9750/PSAS.105.255.261. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8887. Acesso em: 25 apr. 2024.