Duns, Professor. “Notes (a) on a Helmet Found at Ancrum Moor, (b) on Helmets, and (c) on a Stone Axe (New Guinea)”. Proceedings of the Society of Antiquaries of Scotland 30 (November 30, 1896): 317–324. Accessed April 26, 2024. https://journals.socantscot.org/index.php/psas/article/view/6629.