Perera, S.A.S.P.; Vithana, M.D.K.; Jayasekera, S.J.B.A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Senanayake, S.R.H.L.K.; Kodithuwakku, K.A.H.T.; Wickramasinghe, H.K.J.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Gunathilaka, R.P.D.; Jayasundera, J.M.M.A.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Rupanjali, A.P.D.; Jayasundera, J.M.M.A.; Fernandopulle, M.N.D.; Marikkar, J.M.N.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)