↑ J. Collingwood Bruce (1868; cited in Beckensall, S., Northumberland's Prehistoric Rock Carvings: A Mystery Explained. Pendulum Publications, Rothbury, Northumberland. 1983:19)
↑ Ronald Morris, The Prehistoric Rock Art of Galloway and The Isle of Man (ISBN 978-0-7137-0974-2 , Blandford Press 1979
↑ [see Lewis-Williams, D. 2002. A Cosmos in Stone: Interpreting Religion and Society through Rock Art. Altamira Press, Walnut Creek, Ca.]
↑ Parkington, J. Morris, D. & Rusch, N. 2008. Karoo rock engravings. Clanwilliam: Krakadouw Trust; Morris, D. & Beaumont, P. 2004. Archaeology in the Northern Cape: some key sites. Kimberley: McGregor Museum.
