Callander, J Graham. “Long Cairns and Other Prehistoric Monuments in Aberdeenshire and Banffshire, and a Short Cist at Bruceton, Alyth, Perthshire”. Proceedings of the Society of Antiquaries of Scotland 59 (November 30, 1925): 21–28. Accessed April 24, 2024. https://journals.socantscot.org/index.php/psas/article/view/7627.