R.W.B. Morris and M.A.M. van Hoek Rock Carvings in the Garlieston Area, Wigtown District Prehistory (General) TDGNHAS Series III, 62 (1987), 32(WARNING very large file size: 27.9 MB)
M.A.M. van Hoek Possible Axehead Carvings at Knock, Wigtownshire Prehistory (General), Archaeology (General) TDGNHAS Series III, 63 (1988), 89(WARNING very large file size: 23.36 MB)
