Mackenzie, W M. “Notes on Certain Structures of Archaic Type in the Island of Lewis - Beehive Houses, Duns, and Stone Circles”. Proceedings of the Society of Antiquaries of Scotland 38 (November 30, 1904): 173–204. Accessed April 26, 2024. https://journals.socantscot.org/index.php/psas/article/view/6976.