Paterson, Caroline, and Katherine Eremin. “The Viking-Age Trefoil Mount from Jarlshof: A Re-Appraisal in the Light of Two New Discoveries”. Proceedings of the Society of Antiquaries of Scotland 127 (November 30, 1998): 649–657. Accessed April 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/9980.