Nasliya, A.M.F.; Herath, H.M.L.K.; Balasooriya, B.M.D.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Perera, B.S.P.S.S.; Fernandopulle, M.N.D.; Sherath, C.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Athukorala, A.C.H.; Jayasinghe-Mudalige, U.K.; Silva, K.D.R.R.; Chadrasekera, G.A.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2006)