Krishnakumar A K, . (2004). Rubber vilayum aagola uthpadanavum. : Karshakan.
Krishnakumar A K, . 2004. Rubber vilayum aagola uthpadanavum. : Karshakan.
Krishnakumar A K, . Rubber vilayum aagola uthpadanavum. : Karshakan. 2004.
