Sajeewani, H.V.A.; Galahityawa, G.L.C.; Gajanayake, K.G.M.C.P.B.; Marapana, W.M.U.A.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Indrarathne, W.V.C.J.; Johnpillai, N.V.B.; Dunsford, L.B.; Karunarathne, K.H.M.I.; Gajanayake, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)