“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”. 1869. Proceedings of the Society of Antiquaries of Scotland 8 (November): 48-49. https://doi.org/10.9750/PSAS.008.48.49.