RITCHIE, James. Notes on some Stone Circles in the South of Aberdeenshire and North of Kincardineshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 53, p. 64–75, 1919. DOI: 10.9750/PSAS.053.64.75. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7455. Acesso em: 26 apr. 2024.