CHRISTISON, David. Duke Murdoch’s Castle, Loch Ard, Perthshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 41, p. 420–423, 1907. DOI: 10.9750/PSAS.041.420.423. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7091. Acesso em: 29 apr. 2024.