Jayasena, M.K.A.S.; Iqbal, M.C.M.; Attanayaka, D.P.S.T.G.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Rathnasekara, G.N.C.; Gajanayake, K.G.M.C.P.B.; Abeyagunawardene, C.D.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Galagoda, R.P.W.M.R.R.K.B.; Gajanayake, K.G.M.C.P.B.; Silva, D.A.C.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)