Rathnayaka, L.A.; Weerakkody, W.J.S.K.; Kumara, N.K.V.M.R.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Ruwanmali, W.M.D.; Eeswara, J.P.; Ratnayake, R.H.M.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Chandrasiri, P.S.S.W.; Abeynayake, N.R.; Wijeyewardena, L.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Jayakody, J.A.D.S.S.; Tennakoon, N.A.; Fernandopulle, M.N.D.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)