Motha, M.R.; Gajanayake, K.G.M.C.P.B.; Sarukkali, P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Kumara, R.N.S.; Gajanayake, K.G.M.C.P.B.; Srirwardene, U.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)