Coles, Frederick R. “Report on Stone Circles Surveyed in Perthshire - North Eastern Section; With Measured Plans and Drawings (obtained under the Gunning Fellowship)”. Proceedings of the Society of Antiquaries of Scotland 42 (November 30, 1908): 95–162. Accessed April 24, 2024. https://journals.socantscot.org/index.php/psas/article/view/7126.