Maclagan, C, and John Stuart. “On the Round Castles and Ancient Dwellings of the Valley of the Forth, and Its Tributary the Teith”. Proceedings of the Society of Antiquaries of Scotland 9 (November 30, 1872): 29-44. Accessed March 29, 2024. http://journals.socantscot.org/index.php/psas/article/view/5495.