Curle, James, and Harry F Tagg. “Note on a Primitive Weapon or Tool, Fashioned by Fixing a Stone in a Wooden Shaft, Found in a Moss at Bogancloch, Parish of Rhynie, Aberdeenshire: With a Report on Wood of the Haft”. Proceedings of the Society of Antiquaries of Scotland, vol. 59, Nov. 1925, pp. 18-20, doi:10.9750/PSAS.059.18.20.