Barclay, G., M. V. Andrews, A. M. Blackham, D. Gilbertson, J. A. Lee, M. van der Veen, J. S. Rideout, and A. Townshend. “Excavations at Upper Suisgill, Sutherland”. Proceedings of the Society of Antiquaries of Scotland, Vol. 115, Nov. 1987, pp. 159-98, doi:10.9750/PSAS.115.159.198.