Kusumsena, H.J.M.; Wickramananda, I.R.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Razmy, M.A.A.; Athauda, A.M.T.P.; Arachchige, T.D.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Pushpakumara, A.W.S.; Karunarathne, K.H.M.I.; Weerakkody, W.J.S.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Edirisinghe, D.P.D.S.; Athauda, A.M.T.P.; Yapa, G.B.; Jayawardana, C.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)