Eeles, Francis C. “Two Incised Slabs: At Foveran, Aberdeenshire, and Oathlaw, Forfarshire”. Proceedings of the Society of Antiquaries of Scotland 43 (November 30, 1909): 308–316. Accessed April 26, 2024. https://journals.socantscot.org/index.php/psas/article/view/7153.