Lewis, John, G Haggarty, and D Gallagher. “Excavations at Newark Castle, Port Glasgow, 1984 and 1997”. Proceedings of the Society of Antiquaries of Scotland 128 (November 30, 1999): 905–921. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/10031.