Ritchie, A., Bramwell, D., Collins, G. H., Dickson, C., Evans, J. G., Henshall, A. S., Inskeep, R., Kenward, H., Noddle, B. A., Vaughan, M., Wheeler, A., Whittington, G., & Williams, D. F. (1984). Excavation of a Neolithic farmstead at Knap of Howar, Papa Westray, Orkney. Proceedings of the Society of Antiquaries of Scotland, 113, 40-121. https://doi.org/10.9750/PSAS.113.40.121