Barclay, W. J., Taylor, K., & Thomas, L. P. (1988). Geology of the South Wales coalfield memoir for 1:50 000 geological sheet 231 (England and Wales) / W.J. Barclay,K. Taylor and L.P. Thomas: Memoir for 1:50 000 geological sheet 231 (England and Wales) (3rd ed.). H.M.S.O..
Chicago Style (17th ed.) CitationBarclay, W. J., K. Taylor, and L. P. Thomas. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 231 (England and Wales) / W.J. Barclay,K. Taylor and L.P. Thomas: Memoir for 1:50 000 Geological Sheet 231 (England and Wales). 3rd ed. London: H.M.S.O., 1988.
MLA (9th ed.) CitationBarclay, W. J., et al. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 231 (England and Wales) / W.J. Barclay,K. Taylor and L.P. Thomas: Memoir for 1:50 000 Geological Sheet 231 (England and Wales). 3rd ed. H.M.S.O., 1988.