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.
Citação do estilo Chicago (17ª ed.)Não 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.
Citação MLA (8ª ed.)Não 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.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.