Browne, G. “Notice on a Cup-Marked Boulder Called the Saj Di Gorone, or Stone of the Heel, Near Stresa, on the Lago Maggiore”. Proceedings of the Society of Antiquaries of Scotland 34 (November 30, 1900): 297-299. Accessed March 28, 2024. http://journals.socantscot.org/index.php/psas/article/view/6778.