Anderson, Joseph. “Notes on the Ornamentation of the Silver Brooches Found at Skaill, Orkney, and Now in the Museum”. Proceedings of the Society of Antiquaries of Scotland 15 (November 30, 1881): 286–298. Accessed December 8, 2024. https://journals.socantscot.org/index.php/psas/article/view/5976.