Cita APA

Duggal, K. N. (1966). Elements of environmental engineering (6,rev.Ed.7.). S Chand & Company.

Chicago Edition Citation

Duggal, K. N. Elements of Environmental Engineering. 6,rev.Ed.7. New Delhi: S Chand & Company, 1966.

Cita MLA

Duggal, K. N. Elements of Environmental Engineering. 6,rev.Ed.7. S Chand & Company, 1966.