Smith, John. “Notice of a Peculiar Weapon or Harpoon of Bronze, Found on the Bank of the River Tweed, Near Norham”. Proceedings of the Society of Antiquaries of Scotland 8 (November 30, 1871): 292-301. Accessed March 29, 2024. http://journals.socantscot.org/index.php/psas/article/view/5427.