Jayamali, U.K.D.N.; Weerakkody, W.J.S.K.; Amarasinghe, K.G.A.P.K.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka:Gonawila, 2015)
Jayamali, U.K.D.N.; Weerakkody, W.J.S.K.; Amarasinghe, K.G.A.P.K.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka:Gonawila, 2015)