Herath, H.M.D.T.K.; Atauda, A.M.T.P.; Edirisinghe, J.C.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Damayanthi, K.A.I.; Edirisinghe, J.C.; Gajanayake, K.G.M.C.P.B.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)