SIMPSON, W Douglas. Doune Castle. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 72, p. 73–83, 1938. DOI: 10.9750/PSAS.072.73.83. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8088. Acesso em: 26 apr. 2024.