Pathirana, A.P.C.S.; Sumanasena, H.A.; Fernandopulle, M.N.D.; Amarasinghe, K.G.A.P.K.; Priyadarshani, K.D.N.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Jayathilaka, K.P.R.S.; Kelaniyangoda, D.B.; Ranaweera, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)