Lefond, S. J. (1983). Industrial minerals and rocks (nonmetallics other than fuels) (5th ed.). Society of Mining Engineers.
Citace podle Chicago (17th ed.)Lefond, Stanley J. Industrial Minerals and Rocks (nonmetallics Other than Fuels). 5th ed. New York: Society of Mining Engineers, 1983.
Citace podle MLA (9th ed.)Lefond, Stanley J. Industrial Minerals and Rocks (nonmetallics Other than Fuels). 5th ed. Society of Mining Engineers, 1983.
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