Graeme, A Sutherland. “An Account of the Excavation of the Broch of Ayre, St Mary’s Holm, Orkney”. Proceedings of the Society of Antiquaries of Scotland 48 (November 30, 1914): 31–51. Accessed November 24, 2024. https://journals.socantscot.org/index.php/psas/article/view/7341.