Não informado. (2004). SA mining: South African mining, coal, gold, and base minerals. Johnnic Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Pinegowrie, Africa do Sul: Johnnic Publishing, 2004.
MLA-Zitierstil (8. Ausg.)Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Johnnic Publishing, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.