Pradeep B, Jacob J & Krishnakumar R. (2015). Upagraha sangethika vidyayum rubber krishiyum. : Rubber.
Pradeep B, Jacob J and Krishnakumar R. 2015. Upagraha sangethika vidyayum rubber krishiyum. : Rubber.
Pradeep B, Jacob J and Krishnakumar R. (2015). Upagraha sangethika vidyayum rubber krishiyum. : Rubber.
Pradeep B, Jacob J and Krishnakumar R. Upagraha sangethika vidyayum rubber krishiyum. : Rubber. 2015.
