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)
Madushani, W.V.T.; Jayathilake, Y.M.C.D.; Weerasinghe, W.A.D.S.S.; Perera, G.A.K.S.(Faculty of Applied Sciences, Wayamba University of Sri Lanka, Kuliyapitiya, 2015)
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)