British Geological Survey & Wilson, D. (1990). Geology of the South Wales Coalfield memoir for 1:50 000 geological sheet 261 and 262 (England and Wales) / D. Wilson... [et al.]: Memoir for 1:50 000 geological sheet 261 and 262 (England and Wales) (2nd ed.). HMSO.
Chicago Style (17th ed.) CitationBritish Geological Survey and D. Wilson. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 261 and 262 (England and Wales) / D. Wilson... [et Al.]: Memoir for 1:50 000 Geological Sheet 261 and 262 (England and Wales). 2nd ed. HMSO, 1990.
MLA (9th ed.) CitationBritish Geological Survey and D. Wilson. Geology of the South Wales Coalfield Memoir for 1:50 000 Geological Sheet 261 and 262 (England and Wales) / D. Wilson... [et Al.]: Memoir for 1:50 000 Geological Sheet 261 and 262 (England and Wales). 2nd ed. HMSO, 1990.