Rajapaksha, R.L.T.N.; Silva, D.A.C.; Athauda, A.M.T.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Premarathna, R.G.J.; Mudalige, U.K.Jayasinghe; Gajanayake, G.M.C.P.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Razmy, M.A.A.; Athauda, A.M.T.P.; Arachchige, T.D.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)