“Report on Stone Circles in Perthshire, Principally Strathearn, With Measured Plans and Drawings (obtained under the Gunning Fellowship)”. Proceedings of the Society of Antiquaries of Scotland 45 (November 30, 1911): 46–116. Accessed December 5, 2025. https://journals.socantscot.org/index.php/psas/article/view/7211.