Não informado. (1999). International Mining & Minerals. Institution of Mining Engineers.
Chicagoスタイル(17版)引用形式Não informado. International Mining & Minerals. Doncaster, Inglaterra: Institution of Mining Engineers, 1999.
MLA(8版)引用形式Não informado. International Mining & Minerals. Institution of Mining Engineers, 1999.
警告: この引用は必ずしも正確ではありません.