Ralston, Ian, and Joanna Close-Brooks. “The Arbroath Antiquary Club’s Excavations at Castle Rock Promontory Fort, Auchmithie, Arbroath and Saint Vigeans, Angus District”. Proceedings of the Society of Antiquaries of Scotland 116 (November 30, 1987): 101-115. Accessed March 29, 2024. http://journals.socantscot.org/index.php/psas/article/view/9262.