Não informado. (2003). South African mining, coal, gold & base minerals. Thomson Publication.
Chicago-viite (17. p.)Não informado. South African Mining, Coal, Gold & Base Minerals. Johannesburg, Africa do Sul: Thomson Publication, 2003.
MLA-viite (8. p.)Não informado. South African Mining, Coal, Gold & Base Minerals. Thomson Publication, 2003.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.