(2009). Rubber krishi paadamaala.1. Nilamorukkalum krishiyum (Malayalam). Kottayam: Rubber Board.
2009. Rubber krishi paadamaala.1. Nilamorukkalum krishiyum (Malayalam). Kottayam: Rubber Board.
Rubber krishi paadamaala.1. Nilamorukkalum krishiyum (Malayalam). Kottayam: Rubber Board. 2009.