Não informado. (2020). Bi-Monthly Bulletin of the American Institute of Mining Engineers. American Institute of Mining Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bi-Monthly Bulletin of the American Institute of Mining Engineers. New York: American Institute of Mining Engineers, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bi-Monthly Bulletin of the American Institute of Mining Engineers. American Institute of Mining Engineers, 2020.
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