Barclay, Gordon J, Gordon S Maxwell, and Coralie Mills. 1992. “Excavation of a Neolithic Long Mortuary Enclosure Within the Roman Legionary Fortress at Inchtuthil, Perthshire”. Proceedings of the Society of Antiquaries of Scotland 121 (November):27-44. https://doi.org/10.9750/PSAS.121.27.44.