Calder, Charles S T, and Kenneth A Steer. “Dun Lagaidh and Four Other Prehistoric Monuments Near Ullapool, Ross and Cromarty”. Proceedings of the Society of Antiquaries of Scotland 83 (November 30, 1951): 68–76. Accessed June 24, 2024. https://journals.socantscot.org/index.php/psas/article/view/8332.