Paton, V.A.N. 1928. Notes on a Vitrified Fort at ’An-Cnap,’ Sannox, Arran, and Vitrified Stones at Mid Sannox, Arran, and at Pennymore, Furnace, Loch Fyne. Proceedings of the Society of Antiquaries of Scotland. 62, (Nov. 1928), 239–245. DOI:https://doi.org/10.9750/PSAS.062.239.245.