CANNEL, John; TABRAHAM, Christopher. Excavations at Duffus castle, Moray. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 124, p. 379–390, 1995. DOI: 10.9750/PSAS.124.379.390. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9503. Acesso em: 7 may. 2024.