Thilakarthne, N.S.; Weerakkody, W.J.S.K.; Wijesundara, D.S.A.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Gunawardena, S.V.; Edirisinghe, E.S.C.; Wasala, S.K.; Kottearachchi, N.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Swarnathilake, D.S.G.G.C.; Abeysinghe, D.C.; Liyanage, D.N.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Jayaweera, S.L.D.; Basnayake, B.M.V.S.; Dassanayake, E.M.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)