Mahawaththge, S.A.; Perera, W.G.S.; Dassanayake, E.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Edirisinghe, E.A.D.D.; Withanage, S.P.; Attanayaka, D.P.S.T.G.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Fernando, W.P.D.K.; Chandrasiri, A.D.N.; Abeygunawardhana, W.W.; Malkanthi, R.M.S.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)