Alcock, Leslie, and Elizabeth Alcock. “Reconnaissance Excavations on Early Historic Fortifications and Other Royal Sites in Scotland, 1974-84: 4, Excavations at Alt Clut, Clyde Rock, Strathclyde, 1974-75”. Proceedings of the Society of Antiquaries of Scotland 120 (November 30, 1991): 95-149. Accessed February 5, 2023. http://journals.socantscot.org/index.php/psas/article/view/9385.