Bailey, A., Armit, I., Swain, M., Cross, J., Nicholaisen, W., Hicks, C., Morris, C., Mackie, E., Evans, G. and Richards, C. (1992) “Lecture Summaries”, Proceedings of the Society of Antiquaries of Scotland, 121, pp. 443-454. doi: 10.9750/PSAS.121.443.454.