APA-viite (7. p.)

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.

Chicago-viite (17. p.)

Nigro, 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.

MLA-viite (9. p.)

Nigro, John C. Firing an Iron Ore Pelletizing Kiln with Low-Btu Gas from Lignite. U.S. Dept. of the Interior, Bureau of Mines, 1982.