Smith, John Alexander, and Stevenson McAdam. “Notice of Bronze Celts or Axe Heads, Which Have Apparently Been Tinned; Also of Bronze Weapons and Armlets, Found Along With Portions of Metallic Tin Near Elgin in 1868”. Proceedings of the Society of Antiquaries of Scotland, vol. 9, Nov. 1873, pp. 428-43, doi:10.9750/PSAS.009.428.443.