Watson, W.J. 1915. Circular Forts in Lorn and North Perthshire; with a Note on the Excavation of one at Borenich, Loch Tummel. Proceedings of the Society of Antiquaries of Scotland. 49, (Nov. 1915), 17–32. DOI:https://doi.org/10.9750/PSAS.049.17.32.