Chadrasekera, C.M.C.P.; Perera, D.A.M.; Abeysinghe, D.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Gamhewage, B.; Jayasinghe-Mudalige, U.K.; Edirisinghe, J.C.; Mendis, M.S.S.; Perera, D.A.M.; Udugama, J.M.M.; Herath, H.M.L.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)