Richardson, J.S. 1907. Notice of Kitchen-midden Deposits on North Berwick Law, and other Antiquities in the vicinity of North Berwick; with a Note of an Undescribed Sculptured Stone, with Symbols, in the Island of Raasay. Proceedings of the Society of Antiquaries of Scotland. 41, (Nov. 1907), 424–436. DOI:https://doi.org/10.9750/PSAS.041.424.436.