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Barclay, W.J. (2005). "1: Introduction to the Old Red Sandstone of Great Britain"(PDF). In Barclay, W.J.; Browne, M.A.E.; McMillan, A.A.; Pickett, E.A.; Stone, P.; Wilby, P.R. (eds.). The Old Red Sandstone of Great Britain. Geological Conservation Review Series. Vol. 31. Joint Nature Conservation Committee. ISBN978-1-86107-543-7. Archived from the original(PDF) on 7 March 2012. Retrieved 26 February 2012.