Não informado. (2004). SA mining: South African mining, coal, gold, and base minerals. Johnnic Publishing.
Chicago (17e ed.) BronvermeldingNão informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Pinegowrie, Africa do Sul: Johnnic Publishing, 2004.
MLA (8e ed.) BronvermeldingNão informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Johnnic Publishing, 2004.
Let op: Deze citaties zijn niet altijd 100% accuraat.