Safreen, J.M.; Shanthasiri, J.G.; De Silva, S.N.T.; Fernando, C.A.N.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
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)