Stuart, John. “Historical Notices of St Fillan’s Crozier, and of the Devotion of King Robert Bruce to St. Fillan”. Proceedings of the Society of Antiquaries of Scotland 12 (November 30, 1877): 134–182. Accessed December 8, 2024. https://journals.socantscot.org/index.php/psas/article/view/5806.