Gran Bretaña. Imperial Mineral Resources Bureau & Imperial Institute (Gran Bretaña). (1921). The mineral industry of the British Empire and foreign countries: Statistical summary (production, imports and exports). His Majesty's Stationery Office.
Cita Chicago Style (17a ed.)Gran Bretaña. Imperial Mineral Resources Bureau y Imperial Institute (Gran Bretaña). The Mineral Industry of the British Empire and Foreign Countries: Statistical Summary (production, Imports and Exports). London: His Majesty's Stationery Office, 1921.
Cita MLA (9a ed.)Gran Bretaña. Imperial Mineral Resources Bureau y Imperial Institute (Gran Bretaña). The Mineral Industry of the British Empire and Foreign Countries: Statistical Summary (production, Imports and Exports). His Majesty's Stationery Office, 1921.
