Carr, D. D., Alsobrook, A. F., & Alsobrook, A. F. (1994). Industrial minerals and rocks (6th ed.). Littleton, Colorado: Society for Mining, Metallurgy, and Exploration.
Παραπομπή Chicago StyleCarr, Donald D., A. Frank Alsobrook, and A. Frank Alsobrook. Industrial Minerals and Rocks. 6th ed. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, 1994.
Παραπομπή MLACarr, Donald D., A. Frank Alsobrook, and A. Frank Alsobrook. Industrial Minerals and Rocks. 6th ed. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, 1994.
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