Não informado. (1949). Mining transactions. American Institute of Mining, Metallurgical and Petroleum Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Mining Transactions. New York: American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Mining Transactions. American Institute of Mining, Metallurgical and Petroleum Engineers, 1949.
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