Stevenson, J H. “Note on Three Metal Matrices of Seals (of Apparently the Thirteenth Century or Thereby) in the National Museum of Antiquities, Which Bear the Emblem of the Stag-Head Cabossed”. Proceedings of the Society of Antiquaries of Scotland 60 (November 30, 1926): 218–226. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/7669.