Brophy, Kenneth, and Dene Wright. “Possible Neolithic Ard Marks and Field Boundaries at Wellhill and Cranberry, Perth and Kinross, and an Evaluation of Current Physical Evidence for Neolithic Farming in Scotland”. Proceedings of the Society of Antiquaries of Scotland 150 (November 30, 2021): 23–47. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/10458.