1. Anderson, Joseph, Scotland in Pagan Times – volume 1: The Iron Age, David Douglas: Edinburgh 1883.
  2. Armit, Ian, Scotland’s Hidden History, Tempus: Stroud 1998.
  3. Barclay, Gordon, “Newmill and the ‘souterrains of southern Pictland’”, in Proceedings Society of Antiquaries, Scotland, volume 110, 1980.
  4. Clark, Evelyn, Cornish Fogous, Methuen: London 1961.
  5. Curle, James, “An Inventory of Objects of Roman and Provincial Roman Origin Found on Sites in Scotland not Definitely Associated with Roman Constructions“,  inProceedings Society of Antiquaries, Scotland, volume 66, 1932.
  6. Horsburgh, James, Notes of Cromlechs, Duns, Hut-circles, Chambered Cairns and other Remains, in the County of Sutherland“, in Proceedings Society of Antiquaries, Scotland, volume 7, 1870
  7. Jervise, A., “Notice of Antiquities in the Parish of Airlie, Forfarshire,” in Proceedings of the Society of Antiquaries, Scotland, volume 5, 1864.
  8. McBeath, H.D., Walks by Busby and Thorntonhall, with Historical Notes on the Area, EKDC: East Kilbride 1980.
  9. MacDougall, Betty, Isle of Coll, John Miller: Glasgow 1966.
  10. Mackie, Euan, Scotland: An Archaeologial Guide, Faber: London 1975.
  11. MacRitchie, David, The Testimony of Tradition, Kegan Paul: London 1890.
  12. MacRitchie, David, “Description of an Earth-house at Pitcur, Forfarshire,” inProceedings Society of Antiquaries, Scotland, volume 34, 1900.
  13. Pagan, James (ed.), Glasgow, Past and Present – volume 2, David Robertson: Glasgow 1856.
  14. Ritchie, Graham, “Early Settlement in Argyll,” in The Archaeology of Argyll, Edinburgh University Press 1997.
  15. Royal Commission on the Ancient & Historical Monuments, Scotland, Argyll – volume 3: Mull, Tiree, Coll and Northern Argyll, HMSO: Edinburgh 1980.
  16. Royal Commission of Ancient & Historicc Monuments, Scotland, The Archaeological Sites and Monuments of Scotland: Central Angus, RCAHMS: Edinburgh 1983.
  17. Ross, William, Busby and its Neighbourhood, David Bryce: Glasgow 1883.
  18. Small, Alan & Thoms, L.M., The Picts in Tayside, Dundee 1990.
  19. Smith, James, “Parish of Cathcart,” in New Statistical Account of Scotland – volume 7: Renfrew, William Blackwood: Edinburgh 1845.
  20. Stuart, John, “Notice of Underground Chambers recently Excavated on the Hill of Cairn Conan, Forfarshire,” in Proceedings Society of Antiquaries, Scotland – volume 3, 1862.
  21. Wainwright, F.T., The Souterrains of Southern Pictland, RKP: London 1963.
  22. Warden, Angus J., Angus or Forfarshire – volume 1, Charles Alexander: Dundee 1880.
  23. Watkins, Trevor, “Excavation of a Settlement and a Souterrain at Newmill, near Bankfoot, Perthshire,” in Proceedings Society of Antiquaries, Scotland, volume 110, 1980.