Smith, J.A. 1879. Notice of the Remains of the Great Auk, or Gare-fowl (Alca Impennis, Linn.), found in Caithness; with Notes of its Occurrence in Scotland and of its Early History. Proceedings of the Society of Antiquaries of Scotland. 13, (Nov. 1879), 76–105. DOI:https://doi.org/10.9750/PSAS.013.76.105.