Disaanayaka, D.M.S.; Kottearachchi, N.S.; Weerasena, O.V.D.S.J.; Peiris, W.A.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
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)
Fernando, B.K.N.S.; Jayaweera, B.P.A.; Ranaweera, B.; Edirisinghe, U.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)