Não informado. (2022). Memoirs. Department of Mineral and Energy Affairs.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Memoirs. Pretoria, Africa do Sul: Department of Mineral and Energy Affairs, 2022.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Memoirs. Department of Mineral and Energy Affairs, 2022.
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