Wijesekara, U.A.D.S.L.; Kottearachchi, N.S.; Dahanayaka, B.A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Madhushani, R.D.T.D.; Athauda, A.M.T.P.; Wijeyewardena, H.M.S.L.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)