Colhoun, Eric A. “On the Nature of the Glaciations and Final Deglaciation of the Sperrin Mountains and Adjacent Areas in the North of Ireland”. Irish Geography 6, no. 2 (January 2, 2017): 162–185. Accessed February 21, 2025. https://irishgeography.ie/index.php/irishgeography/article/view/970.