Ray, Keith, and Andrew T Chamberlain. “Peat Depth Variability at Machrie North, Arran, and Its Implications for Archaeological Survey and Conservation in British Uplands”. Proceedings of the Society of Antiquaries of Scotland 115 (November 30, 1987): 75–87. Accessed April 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/9201.