Abeywardana, B.G.H.; Jayasundera, S.H.; Kumara, N.K.D.C.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Indulgoda, I.P.M.; Loganathan, M.B.; Jayasekera, S.J.B.A.; Ranaweera, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Rathnasekera, U.S.; Kannangara, K.N.; Perera, P.I.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Sampath, V.P.S.; Zuhry, A.L.M.; Weerakkody, W.J.S.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Jayasundara, J.M.D.M.; Ranundeniya, R.M.N.S.; Lakmali, W.A.S.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)