Brodie, James. “Notice of a Collection of Flint Implements Found in the Neighbourhood of Fordun, Kincardineshire, Now Presented to the Museum”. Proceedings of the Society of Antiquaries of Scotland 9 (November 30, 1871): 499–503. Accessed April 19, 2024. https://journals.socantscot.org/index.php/psas/article/view/5530.