Iron Age defended settlement and later building remains near Gowanburn (Kielder) - Source of Reference
(2) Dodds, M.H., 1940. History of Northumberland, volume 15 (Newcastle upon Tyne), 56.
(3) Hogg, A.H.A., 1947. Proceedings of the Society of Antiquaries of Newcastle (4th Series), 168.
(4) Further information about the protected nature of this site can be obtained from here.