Peddie, J. (1869) “Note by James Peddie, Esq., C.E., F.S.A. Scot., respecting a Sculptured Stone found in taking down a house at the foot of Mary King’s Close, Edinburgh”, Proceedings of the Society of Antiquaries of Scotland, 8, pp. 48–49. doi: 10.9750/PSAS.008.48.49.