Wijebandara, K.M.N.; Fernando, L.C.P.; Fernandopulle, M.N.D.; Suwandharathne, N.I.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Rajapaksha, R.P.K.M.; Suwandharathne, N.I.; Amarasinghe, K.G.A.P.K.; Aratchige, N.S.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)