Curle, J., & Tagg, H. (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. Proceedings of the Society of Antiquaries of Scotland, 59, 18-20. https://doi.org/10.9750/PSAS.059.18.20