Hanson, W S, H Gordon Slade, Leslie J Macfarlane, Betty Willsher, and John R Baldwin. “Lecture Summaries”. Proceedings of the Society of Antiquaries of Scotland 118 (November 30, 1989): 319–325. Accessed April 26, 2024. https://journals.socantscot.org/index.php/psas/article/view/9346.