Abeyrathna, K.A.S.L.; Edirisinghe, E.R.S.P.; Wijesinghe, S.A.E.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
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)
Jayasuriya, S.H.P.; Gajanayake, K.G.M.C.P.B.; Abeysinghe, D.C.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)