RITCHIE, James. Notes on some Stone Circles in Central Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 51, p. 30–47, 1917. DOI: 10.9750/PSAS.051.30.47. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7406. Acesso em: 23 apr. 2024.