Duggal, K. N. (2002). Elements of environmental engineering (6th ed.). S. Chand.
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Dyfyniad Arddull Chicago
Duggal, K. N. Elements of Environmental Engineering. 6th ed. New Delhi: S. Chand, 2002.
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Dyfyniad MLA
Duggal, K. N. Elements of Environmental Engineering. 6th ed. S. Chand, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.