COLES, Frederick R. Report on Stone Circles surveyed in Perthshire (South-east District), with measured Plans and Drawings; obtained under the Gunning Fellowship. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 43, p. 93–130, 1909. DOI: 10.9750/PSAS.043.93.130. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7138. Acesso em: 25 apr. 2024.