Pollock, R. W., Boardman, S., Smith, C., Crone, A., & Moffat, B. (1993). The excavation of a souterrain and roundhouse at Cyderhall, Sutherland. Proceedings of the Society of Antiquaries of Scotland, 122, 149–160. https://doi.org/10.9750/PSAS.122.149.160