Não informado. (2012). Summary of Progress of the Geological Survey of Great Britain and the Museum of Practical Geology with Report of the Geological Survey Board. Her Majesty's Stationery Office.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Summary of Progress of the Geological Survey of Great Britain and the Museum of Practical Geology with Report of the Geological Survey Board. London: Her Majesty's Stationery Office, 2012.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Summary of Progress of the Geological Survey of Great Britain and the Museum of Practical Geology with Report of the Geological Survey Board. Her Majesty's Stationery Office, 2012.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.