Ranaweera, C.D.; Gunathilaka, H.A.W.S.; Widanapathirana, A.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Udadeniya, A.G.S.G.; Amadoru, I.J.; Abeysinghe, D.C.; Gunathilaka, H.A.W.S.; Dharmadasa, R.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Kadigamuwa, H.M.J.J.K.; Sumanasena, H.A.; Gunathilaka, H.A.W.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Perera, W.R.S.; Amadoru, I.J.; Gunathilaka, H.A.W.S.; Abeysinghe, D.C.; Dharmadasa, R.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)