“Report on the Sculptured Stones Older Than A.D. 1100, With Symbols and Celtic Ornament, in the District of Scotland South of the River Dee; Obtained under the Victoria Jubilee Gift of His Excellency Dr. R. H. Gunnning, F.S.A. Scot”. 1892. Proceedings of the Society of Antiquaries of Scotland 26 (November): 251-59. https://doi.org/10.9750/PSAS.026.251.259.