Nyrsa, H. (2006). Study on the use and concentration of agrochemicals in Kuttanad region with special reference to chemical fertilizers ( At Kerala State Pollution Control Board Central Laboratory, Cochin) (MSc.).

Nyrsa, H. Study on the Use and Concentration of Agrochemicals in Kuttanad Region with Special Reference to Chemical Fertilizers ( At Kerala State Pollution Control Board Central Laboratory, Cochin). MSc. Kottayam, School of Environmental Science, M G University, 2006.

Nyrsa, H. Study on the Use and Concentration of Agrochemicals in Kuttanad Region with Special Reference to Chemical Fertilizers ( At Kerala State Pollution Control Board Central Laboratory, Cochin). MSc. 2006.