Barclay, Gordon J, Gordon S Maxwell, and Coralie Mills. “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 30, 1992): 27–44. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/9398.