Dissanayake, K.M.R.; Rodrigo, V.H.L.; Balasooriya, B.M.D.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Hettiarachchi, L.G.; Wijesuriya, W.; Nugawela, A.; Sankalpa, J.K.S.; Karunaratne, S.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Liyanagama, N.L.; Nugawela, R.C.W.M.R.A.; Attanayaka, D.P.S.T.G.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)