Curle, J., & Tagg, H. F. (1925). 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, 59, 18–20. https://doi.org/10.9750/PSAS.059.18.20