Woolliscroft, David J, and Birgitta Hoffmann. “The Roman Gask System Fortlet of Glenbank, Perthshire”. Proceedings of the Society of Antiquaries of Scotland 139 (November 30, 2010): 167–193. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/9749.