Christison, David, and Joseph Anderson. “On the Recently Excavated Fort on Castle Law, Abernethy, Perthshire: With Notes on Finds”. Proceedings of the Society of Antiquaries of Scotland 33 (November 30, 1899): 13–33. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/6723.