(2008). Rubber Rogangalum Nivarana Margangalum. Kottayam: Rubber Research Institute of India.
2008. Rubber Rogangalum Nivarana Margangalum. Kottayam: Rubber Research Institute of India.
Rubber Rogangalum Nivarana Margangalum. Kottayam: Rubber Research Institute of India. 2008.
