Nigro, J. C. (1982). Firing an iron ore pelletizing kiln with low-Btu gas from lignite. U.S. Dept. of the Interior, Bureau of Mines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNigro, John C. Firing an Iron Ore Pelletizing Kiln with Low-Btu Gas from Lignite. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNigro, John C. Firing an Iron Ore Pelletizing Kiln with Low-Btu Gas from Lignite. U.S. Dept. of the Interior, Bureau of Mines, 1982.
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