Report on the Sculptured Stones Older Than A.D. 1100, With Symbols and Celtic Ornament, in the District of Scotland, North of the River Dee; Obtained under the Victoria Jubilee Gift of His Excellency Dr. R. H. Gunning, F.S.A. Scot. PSAS 1891, 25, 422-431. https://doi.org/10.9750/PSAS.025.422.431.