Lacaille, A. D. (1927) “The Capelrig Cross, Mearns, Renfrewshire: St Blane’s Chapel, Lochearnhead, Perthshire; and a Sculptured Slab at Kilmaronock, Dumbartonshire”, Proceedings of the Society of Antiquaries of Scotland, 61, pp. 122–142. doi: 10.9750/PSAS.061.122.142.