Callander, J Graham. 1926. “Notices of (1) a Stone Axe-Hammer from Perthshire; And (2) Prehistoric and Mediaeval Graves on Airngath Hill, Near Bo’ness”. Proceedings of the Society of Antiquaries of Scotland 60 (November):257-61. https://doi.org/10.9750/PSAS.060.257.261.