Kulathilaka, K.C.S.; Ratnayake, R.H.M.K.; Amarasinghe, A.A.T.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Amarasinghe, A.A.T.B.; Priyantha, W.S.; Rathnayake, R.H.M.K.; Wickramasinghe, W.M.E.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Dissanayake, D.M.P.S.; Ratnayake, R.H.M.K.; Amarasinghe, A.A.T.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)