Kingston, G. A. (1962). The Pacific Northwest ferroalloy industry. U.S. Dept. of the Interior, Bureau of Mines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKingston, Gary A. The Pacific Northwest Ferroalloy Industry. [Washington]: U.S. Dept. of the Interior, Bureau of Mines, 1962.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKingston, Gary A. The Pacific Northwest Ferroalloy Industry. U.S. Dept. of the Interior, Bureau of Mines, 1962.
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