“Notice of a Portrait Group of Margaret Tudor, the Regent Albany, and a Third Figure; The Property of the Marquis of Bute, at Cardiff Castle, Glamorganshire”. Proceedings of the Society of Antiquaries of Scotland 27 (November 30, 1893): 186–205. Accessed December 5, 2025. https://journals.socantscot.org/index.php/psas/article/view/6513.