“Notes on a Vitrified Fort at ’An-Cnap,’ Sannox, Arran, and Vitrified Stones at Mid Sannox, Arran, and at Pennymore, Furnace, Loch Fyne”, PSAS, vol. 62, pp. 239–245, Nov. 1928, doi: 10.9750/PSAS.062.239.245.