Botkin, D. B., & Keller, E. A. (2012). Environmental science: International student version (8th ed.). John Wiley & Sons.
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Dyfyniad Arddull Chicago
Botkin, Daniel B., and Edward A. Keller. Environmental Science: International Student Version. 8th ed. New Delhi: John Wiley & Sons, 2012.
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Dyfyniad MLA
Botkin, Daniel B., and Edward A. Keller. Environmental Science: International Student Version. 8th ed. John Wiley & Sons, 2012.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.