Nebel, B. J., & Wright, R. T. (1998). Environmental science: The way the world works (6th ed.). Prentice Hall.
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Dyfyniad Arddull Chicago
Nebel, Bernard J., and Richard T. Wright. Environmental Science: The Way the World Works. 6th ed. Upper Saddle River, NJ: Prentice Hall, 1998.
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Dyfyniad MLA
Nebel, Bernard J., and Richard T. Wright. Environmental Science: The Way the World Works. 6th ed. Prentice Hall, 1998.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.