Lacaille AD. Some Antiquities in Strathfillan, Perthshire. Cupped Boulder near Helensburgh, and Cross-slabs in Glen Fruin, Dumbartonshire. PSAS [Internet]. 1924 Nov. 30 [cited 2024 Nov. 22];58:124-30. Available from: https://journals.socantscot.org/index.php/psas/article/view/7612