British Geological Survey, Waters, R. A., & Lawrence, D. J. D. (1987). Geology of the South Wales Coalfield memoir for 1:50 000 geological sheet 263 (England and Wales) / R. A. Waters and D. J. D. Lawrence: Memoir for 1:50 000 geological sheet 263 (England and Wales) (3rd ed.). H.M.S.O..
Chicago Style (17th ed.) CitationBritish Geological Survey, R. A. Waters, and D. J. D. Lawrence. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 263 (England and Wales) / R. A. Waters and D. J. D. Lawrence: Memoir for 1:50 000 Geological Sheet 263 (England and Wales). 3rd ed. London: H.M.S.O., 1987.
MLA (9th ed.) CitationBritish Geological Survey, et al. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 263 (England and Wales) / R. A. Waters and D. J. D. Lawrence: Memoir for 1:50 000 Geological Sheet 263 (England and Wales). 3rd ed. H.M.S.O., 1987.