Mortley bastle (Wark) - Source of Reference
(2) Ramm, H.G., MacDowall, R.W. and Mercer, E. 1970. Shielings and Bastles (London), 93, no.73.
(3) Ryder, P.F., 1995. Towers and Bastles in Northumberland, Part 4 Tynedale District, Volume 2, 154. This is an unpublished report. Further information can be obtained from here.
(4) Further details about the protected nature of this site can be obtained from here.