Abercromby, John. “Report on Excavations at Fethaland and Trowie Knowe, Shetland; And of the Exploration of a Cairn on Dumglow, One of the Cleish Hills, Kinross-Shire”. Proceedings of the Society of Antiquaries of Scotland 39 (November 30, 1905): 171–184. Accessed December 6, 2024. https://journals.socantscot.org/index.php/psas/article/view/6936.