Piggott, C. M., Platt, M. I., Orr, M. Y., Wallis, F. S., & Hallimond, A. F. (1950). The excavations at Hownam Rings, Roxburghshire, 1948. Proceedings of the Society of Antiquaries of Scotland, 82, 193–225. https://doi.org/10.9750/PSAS.082.193.225