Kumarasinghe, A.A.B.; Sumanasena, H.A.; Silva, S.I.C.; Amarasinghe, K.G.A.P.K.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Dharmathilaka, R.S.M.S.S.; Amadoru, I.J.; Gunathilake, H.A.W.S.; Abeysinghe, D.C.; Dharmadasa, R.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)