Não informado. (2003). South African mining, coal, gold & base minerals. Thomson Publication.
Lua i Stíl Chicago (17ú heag.)Não informado. South African Mining, Coal, Gold & Base Minerals. Johannesburg, Africa do Sul: Thomson Publication, 2003.
Lua MLA (8ú heag.)Não informado. South African Mining, Coal, Gold & Base Minerals. Thomson Publication, 2003.
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