Não informado. (2022). Memoirs. Department of Mineral and Energy Affairs.
Lua i Stíl Chicago (17ú heag.)Não informado. Memoirs. Pretoria, Africa do Sul: Department of Mineral and Energy Affairs, 2022.
Lua MLA (8ú heag.)Não informado. Memoirs. Department of Mineral and Energy Affairs, 2022.
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