Childe, V Gordon, and Angus Graham. “Some Notable Prehistoric and Medieval Monuments Recently Exmined by the Royal Commission on Ancient and Historical Monuments of Scotland”. Proceedings of the Society of Antiquaries of Scotland 77 (November 30, 1943): 31–49. Accessed April 19, 2024. https://journals.socantscot.org/index.php/psas/article/view/8194.