Dewagedara, D.M.A.E.I.; Wijesinghe, S.A.E.C.; Rathnayake, R.H.M.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Senevirathne, L.P.S.S.G.; Jayasinghe-Mudalige, U.K.; Guruge, T.P.S.R.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)