Silva, S.P.P.; Nayanakantha, N.M.C.; Seneviratne, P.; Nugawela, A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Niran, H.M.L.; Rodrigo, V.H.L.; Nayanakantha, N.M.C.N.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)