Cita APA (7a ed.)
Duggal, K. N. (2002). Elements of environmental engineering (6th ed.). S. Chand.
Cita Chicago Style (17a ed.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. New Delhi: S. Chand, 2002.
Cita MLA (9a ed.)
Duggal, K. N. Elements of Environmental Engineering. 6th ed. S. Chand, 2002.
Precaución: Estas citas no son 100% exactas.