Kesler, S. E. (1994). Mineral resources of economics and the environment. Macmillan College Publishing.
Lua i Stíl Chicago (17ú heag.)Kesler, Stephen E. Mineral Resources of Economics and the Environment. New York: Macmillan College Publishing, 1994.
Lua MLA (9ú heag.)Kesler, Stephen E. Mineral Resources of Economics and the Environment. Macmillan College Publishing, 1994.
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