Ariyarathne, G.S.D.P.C.; Gajanayake, K.G.M.C.P.B.; Jayasinghe-Mudalige, U.K.; Senaweera, L.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Wasana, H.H.L.; Mudalige, Jayasinghe U.K.; Ikram, S.M.M.; Udugama, J.M.M.; Edirisinghe, J.C.; Herath, H.M.T.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)