“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” (1925) Proceedings of the Society of Antiquaries of Scotland, 59, pp. 18–20. doi:10.9750/PSAS.059.18.20.