Black, George. “Notice of a Fragment of a Rune-Inscribed Cross-Slab, Found on Inchmarnock, Buteshire”. Proceedings of the Society of Antiquaries of Scotland 24 (November 30, 1890): 438-443. Accessed October 4, 2023. http://journals.socantscot.org/index.php/psas/article/view/6370.