Não informado. (2003). South African mining, coal, gold & base minerals. Thomson Publication.
Chicagoスタイル(17版)引用形式Não informado. South African Mining, Coal, Gold & Base Minerals. Johannesburg, Africa do Sul: Thomson Publication, 2003.
MLA(8版)引用形式Não informado. South African Mining, Coal, Gold & Base Minerals. Thomson Publication, 2003.
警告: この引用は必ずしも正確ではありません.