APA (7th ed.) Citation

British Geological Survey & Barclay, W. J. (1989). Geology of the south Wales coalfield memoir for 1.50 000 geological sheet 232 (England and Wales): Memoir for 1.50 000 geological sheet 232 (England and Wales) (3rd ed.). HMSO.

Chicago Style (17th ed.) Citation

British Geological Survey and W. J. Barclay. Geology of the South Wales Coalfield Memoir for 1.50 000 Geological Sheet 232 (England and Wales): Memoir for 1.50 000 Geological Sheet 232 (England and Wales). 3rd ed. HMSO, 1989.

MLA (9th ed.) Citation

British Geological Survey and W. J. Barclay. Geology of the South Wales Coalfield Memoir for 1.50 000 Geological Sheet 232 (England and Wales): Memoir for 1.50 000 Geological Sheet 232 (England and Wales). 3rd ed. HMSO, 1989.

Warning: These citations may not always be 100% accurate.