Leonard, J. W., III, Hardinge, B. C., & Leonard, J. W. (1991). Coal preparation (5th ed.). Littleton, Colorado: Society for Mining, Metallurgy, and Exploration.
Παραπομπή Chicago StyleLeonard, Joseph W., III, Byron C. Hardinge, and Joseph W. Leonard. Coal Preparation. 5th ed. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, 1991.
Παραπομπή MLALeonard, Joseph W., III, Byron C. Hardinge, and Joseph W. Leonard. Coal Preparation. 5th ed. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, 1991.
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