Tohutoro APA (7th ed.)
Duggal, K. N. (2002). Elements of environmental engineering (6th ed.). S. Chand.
Tohutoru Kātū Chicago (17th ed.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. New Delhi: S. Chand, 2002.
Tohutoro MLA (9th ed.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. S. Chand, 2002.
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