Curle, Alexander O. 1948. “The Excavation of the ’Wag’ or Prehistoric Cattle-Fold at Forse, Caithness, and the Relation of ’Wags’ to Brochs, and Implications Arising Therefrom”. Proceedings of the Society of Antiquaries of Scotland 80 (November):11-25. https://doi.org/10.9750/PSAS.080.11.25.