Black, G.F. 1893. Report on the Antiquties found in Scotland, and preserved in the British Museum, &c., London, and in the Museum of Science and Art, Edinburgh; obtained under the Jubilee Gift of His Excellency Dr. R. H. Gunning, F.S.A. Scot. Proceedings of the Society of Antiquaries of Scotland. 27, (Nov. 1893), 347–368. DOI:https://doi.org/10.9750/PSAS.027.347.368.