British Geological Survey & Institute of Geological Sciences (Great Britain). (1978). World mineral statistics. H.M.S.O..
Cita Chicago (17th ed.)British Geological Survey i Institute of Geological Sciences (Great Britain). World Mineral Statistics. London: H.M.S.O., 1978.
Cita MLA (8th ed.)British Geological Survey i Institute of Geological Sciences (Great Britain). World Mineral Statistics. H.M.S.O., 1978.
Atenció: Aquestes cites poden no estar 100% correctes.