Apted, M. R., Taylor, A. J., Biek, L., Neill, R. M., & Dunning, G. C. (1965). Excavation at Kildrummy Castle, Aberdeenshire, 1952-62. Proceedings of the Society of Antiquaries of Scotland, 96, 208–236. https://doi.org/10.9750/PSAS.096.208.236