Rupasinghe, E.M.D.I.; Wijesinghe, M.A.K.; Gunasekara, T.M.C.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Ranasinghe, R.A.D.R.A.; Wijesinghe, M.A.K.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Sooriyapperuma, S.R.R.; Wijesinghe, M.A.K.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)