Clerk, George. “Notice of the Roman Altars, &C., Presented by the Right Hon Sir George Clerk of Penicuik, Bart”. Proceedings of the Society of Antiquaries of Scotland 3 (November 30, 1862): 37–43. Accessed April 29, 2024. https://journals.socantscot.org/index.php/psas/article/view/4485.