Traill, William. “Notice of Excavations at Stenabreck and Howmae, in North Ronaldsay, Orkney”. Proceedings of the Society of Antiquaries of Scotland 19 (November 30, 1885): 14–33. Accessed December 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/6130.