SIMPSON, W Douglas. Fyvie Castle. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 73, p. 32–47, 1939. DOI: 10.9750/PSAS.073.32.47. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8099. Acesso em: 25 apr. 2024.