SLADE, H Gordon. Tillycairn Castle, Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 112, p. 497–517, 1983. DOI: 10.9750/PSAS.112.497.517. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9094. Acesso em: 29 apr. 2024.