Hutton, C. A., & Gould, R. N. (1982). Cleaning up coal: A study of coal cleaning and the use of cleaned coal. Ballinger.
Čikaški stil citiranja (17. izdanje)Hutton, Cynthia A., i Robert N. Gould. Cleaning Up Coal: A Study of Coal Cleaning and the Use of Cleaned Coal. Cambridge, Mass: Ballinger, 1982.
MLA način citiranja (9. izdanje)Hutton, Cynthia A., i Robert N. Gould. Cleaning Up Coal: A Study of Coal Cleaning and the Use of Cleaned Coal. Ballinger, 1982.
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