Spellman, F. R., & Stoudt, M. L. (2013). Environmental science: Principles and practices. Scarecrow Press, Inc..
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Dyfyniad Arddull Chicago
Spellman, Frank R., and Melissa L. Stoudt. Environmental Science: Principles and Practices. Lanham, MD: Scarecrow Press, Inc., 2013.
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Dyfyniad MLA
Spellman, Frank R., and Melissa L. Stoudt. Environmental Science: Principles and Practices. Scarecrow Press, Inc., 2013.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.