SIMPSON, W Douglas. The Excavation of Coull Castle, Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 58, p. 45–99, 1924. DOI: 10.9750/PSAS.058.45.99. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7613. Acesso em: 30 apr. 2024.