“Notes on a Vitrified Fort at ’An-Cnap,’ Sannox, Arran, and Vitrified Stones at Mid Sannox, Arran, and at Pennymore, Furnace, Loch Fyne” (1928) Proceedings of the Society of Antiquaries of Scotland, 62, pp. 239–245. doi:10.9750/PSAS.062.239.245.