Não informado. (1974). World mineral statistics. Institute of Geological Sciences.
Chicagoスタイル(17版)引用形式Não informado. World Mineral Statistics. London: Institute of Geological Sciences, 1974.
MLA(8版)引用形式Não informado. World Mineral Statistics. Institute of Geological Sciences, 1974.
警告: この引用は必ずしも正確ではありません.