Graham-Campbell, James. “A Lost Pictish Treasure (and Two Viking-Age Gold Arm-Rings) from the Broch of Burgar, Orkney”. Proceedings of the Society of Antiquaries of Scotland 115 (November 30, 1987): 241–261. Accessed March 26, 2025. //journals.socantscot.org/index.php/psas/article/view/9213.