De, A. K., & De, A. K. (2001). Environmental studies. New Age International.
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Dyfyniad Arddull Chicago
De, Anil Kumar, and Arnab Kumar De. Environmental Studies. Calcutta: New Age International, 2001.
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Dyfyniad MLA
De, Anil Kumar, and Arnab Kumar De. Environmental Studies. New Age International, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.