Não informado. (2014). Mining, People and the Environment. Aspermont.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Mining, People and the Environment. London: Aspermont, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Mining, People and the Environment. Aspermont, 2014.
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