Black, George F. “Notes on a Silver-Mounted Charm-Stone of Rock-Crystal from Inverleny, With Notices of Other Scottish Balls of Rock-Crystal and of Superstitions Connected Therewith”. Proceedings of the Society of Antiquaries of Scotland 29 (November 30, 1895): 439–448. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/6601.