RITCHIE, James. The Sculptured Stones of Clatt, Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 44, p. 203–215, 1910. DOI: 10.9750/PSAS.044.203.215. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7180. Acesso em: 19 apr. 2024.