Ballin, Torben Bjarke, and John Faithfull. “Gazetteer of Arran Pitchstone Sources: Presentation of Exposed Pitchstone Dykes and Sills across the Isle of Arran, and Discussion of the Archaeological Relevance of These Outcrops”. Scottish Archaeological Internet Reports 38 (January 1, 2009): 1–39. Accessed April 26, 2024. https://journals.socantscot.org/index.php/sair/article/view/2404.