Παραπομπή σε μορφή APA (7η εκδ.)

Não informado. (2004). SA mining: South African mining, coal, gold, and base minerals. Johnnic Publishing.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Pinegowrie, Africa do Sul: Johnnic Publishing, 2004.

Παραπομπή σε μορφή MLA (8th εκδ.)

Não informado. SA Mining: South African Mining, Coal, Gold, and Base Minerals. Johnnic Publishing, 2004.

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