Perera, K.S.N.; Ratnayake, R.H.M.K.; Edirisinghe, J.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Bulathsinhala, B.B.M.; Rathnayake, R.M.G.K.B.; Abeynayake, N.R.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Idirisinghe, I.M.S.P.; Rathnayake, R.H.M.K.; Edirisinghe, J.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
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)