(2014). Rubber tappers' directory: Muvattupuha region. Kottayam: Rubber Research Institute of India.
2014. Rubber tappers' directory: Muvattupuha region. Kottayam: Rubber Research Institute of India.
Rubber tappers' directory: Muvattupuha region. Kottayam: Rubber Research Institute of India. 2014.
