Walsh, Samantha, Chris Knüsel, and Nigel Melton. “A Re-Appraisal of the Early Neolithic Human Remains Excavated at Sumburgh, Shetland, in 1977”. Proceedings of the Society of Antiquaries of Scotland 141 (November 30, 2012): 3–17. Accessed April 20, 2024. https://journals.socantscot.org/index.php/psas/article/view/9766.