Bailey, A., I. Armit, M. Swain, J. Cross, W. Nicholaisen, C. Hicks, C. Morris, E. Mackie, G. Evans, and C. Richards. “Lecture Summaries”. Proceedings of the Society of Antiquaries of Scotland, Vol. 121, Nov. 1992, pp. 443-54, doi:10.9750/PSAS.121.443.454.