Cita APA (7th ed.)
Gupta, O. P. (2016). Elements of environmental pollution control. Khanna Book Publishing Co.
Cita Chicago (17th ed.)
Gupta, Om Prakash. Elements of Environmental Pollution Control. New Delhi: Khanna Book Publishing Co, 2016.
Cita MLA (9th ed.)
Gupta, Om Prakash. Elements of Environmental Pollution Control. Khanna Book Publishing Co, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.