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)