REFERENCES

Thnagamani and Shyamala Thangamani, 2003, A text book of environmental studies, Pranav syndicate Pubilcations, Sivakasi

 

Dharmaraj, J., Environmental studies, Tensy Publications, Sivakasi

 

Kumaresan, V., and Arumugam, N., 2015, Environmental Biotechnology, Saras publication, Nagercoil

 

 

water pollution by valli &uma