British Geological Survey, Natural Environment Research Council, Great Britain. Ordnance Survey, & Institute of Geological Sciences. (1968). British Geological Survey 1: 25 000 series. Ordnance Survey.
Chicago Style (17th ed.) CitationBritish Geological Survey, Natural Environment Research Council, Great Britain. Ordnance Survey, and Institute of Geological Sciences. British Geological Survey 1: 25 000 Series. Southampton: Ordnance Survey, 1968.
MLA (8th ed.) CitationBritish Geological Survey, et al. British Geological Survey 1: 25 000 Series. Ordnance Survey, 1968.
Warning: These citations may not always be 100% accurate.