Não informado. (2022). Memoirs. Department of Mineral and Energy Affairs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Memoirs. Pretoria, Africa do Sul: Department of Mineral and Energy Affairs, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Memoirs. Department of Mineral and Energy Affairs, 2022.
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