Coles, Frederick. “Report on the Stone Circles of North-Eastern Scotland, Chiefly in Auchterless and Forgue, With Measured Plans and Drawings, Obtained under the Gunning Fellowship”. Proceedings of the Society of Antiquaries of Scotland 37 (November 30, 1903): 82-142. Accessed March 29, 2024. http://journals.socantscot.org/index.php/psas/article/view/6868.