[1]
Woolliscroft, D.J. and Hoffmann, B. 1999. The Roman Gask system tower at Shielhill South, Perthshire: excavations in 1973 and 1996. Proceedings of the Society of Antiquaries of Scotland. 128, (Nov. 1999), 441–460. DOI:https://doi.org/10.9750/PSAS.128.441.460.