Mirando, J.S.; Fernando, T.H.P.S.; Nugawela, A.; Wijayaratne, C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Waduge, T.D.; Attanayaka, D.P.S.T.G.; Edirisinghe, N.M.H.; Chandrasekeran, N.V.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)