Society of Mining Engineers of AIME & Lefond, S. J. (1983). Industrial minerals and rocks: (nonmetallics other than fuels) (5th ed.). Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers.
Chicago-referens (17:e uppl.)Society of Mining Engineers of AIME och Stanley J. Lefond. Industrial Minerals and Rocks: (nonmetallics Other than Fuels). 5th ed. New York: Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers, 1983.
MLA-referens (8:e uppl.)Society of Mining Engineers of AIME och Stanley J. Lefond. Industrial Minerals and Rocks: (nonmetallics Other than Fuels). 5th ed. Society of Mining Engineers of the American Institute of Mining, Metallurgical, and Petroleum Engineers, 1983.