Bruce, John Collingwood, and Marquess of Lothian. “Notice of a Stone, Bearing a Roman Inscription, Built into a Staircase in Jedburgh Abbey”. Proceedings of the Society of Antiquaries of Scotland 19 (November 30, 1885): 321–326. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/6157.