Herath, H.M.R.A.; Jayasekera, S.J.B.A.; Debarawatta, R.D.N.; Mudalige, Jayasinghe U.K.; Udugama, J.M.M.; Wijerathne, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Jayathilaka, R.M.M.S.; Debarawatta, R.D.N.; Jayasekara, S.J.B.A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)