Ritchie, Anna. “A Fragment of a Pictish Symbol-Bearing Slab With Carving in Relief from Mail, Cunningsburgh, Shetland”. Proceedings of the Society of Antiquaries of Scotland 138 (November 30, 2009): 185–191. Accessed April 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/9722.