Craig, J. R. (1996). Resources of the earth: Origin, use, and environmental impact (2nd ed.). Prentice-Hall, Inc.
Lua i Stíl Chicago (17ú heag.)Craig, James R. Resources of the Earth: Origin, Use, and Environmental Impact. 2nd ed. Upper Saddle River, New Jersey: Prentice-Hall, Inc, 1996.
Lua MLA (9ú heag.)Craig, James R. Resources of the Earth: Origin, Use, and Environmental Impact. 2nd ed. Prentice-Hall, Inc, 1996.
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