Calder, Charles S T. “Notes: (1) A Recumbent Grave-Slab from Breckon, Esha Ness, Shetland”. Proceedings of the Society of Antiquaries of Scotland 92 (November 30, 1961): 114–115. Accessed April 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/8579.