Não informado. (1968). Gold bulletin: Research on gold ant its applications in industry. International Gold Corporation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Gold Bulletin: Research on Gold Ant Its Applications in Industry. Marshalltown, Africa do Sul: International Gold Corporation, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Gold Bulletin: Research on Gold Ant Its Applications in Industry. International Gold Corporation, 1968.
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