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