Holden, T., S. Boardman, T. McNeill, M. Brann, B. Walker, and J. Morrison. “Kisimul, Isle of Barra. Part 1: The Castle and the MacNeills”. Proceedings of the Society of Antiquaries of Scotland, Vol. 146, Nov. 2017, pp. 181-13, doi:10.9750/PSAS.146.1219.