Duns, Professor. “Notes (1) on Smoothing Stones Now Presented to the Museum, (2) on Cure Stones, and (3) on an Adze of Shell”. Proceedings of the Society of Antiquaries of Scotland 13 (November 30, 1879): 279–286. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/5881.