Campbell, Robert. “Notice of the Discovery of Eight Silver Rings or Ancient Wrist or Ankle Rings, in Cists Near Rattar, Dunnet, Caithness”. Proceedings of the Society of Antiquaries of Scotland 9 (November 30, 1871): 422–428. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/5519.