Laing, Henry. “A Note Respecting the Sculptured Cross at St Vigeans, Near Arbroath; Of Which Casts by Mr Henry Laing, Seal Engraver, Were Exhibited”. Proceedings of the Society of Antiquaries of Scotland 1 (November 30, 1855): 294–296. Accessed May 4, 2024. https://journals.socantscot.org/index.php/psas/article/view/3972.