Não informado. (2004). SA mining: South African mining, coal, gold, and base minerals. Johnnic Publishing.
Chicago-referens (17:e uppl.)Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Pinegowrie, Africa do Sul: Johnnic Publishing, 2004.
MLA-referens (8:e uppl.)Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Johnnic Publishing, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.