Karaunarathne, P.G.N.; Siriwardhane, K.P.D.; Jayasekera, S.J.B.A.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Rajapaksha, R.M.S.S.; Siriwardhane, K.P.D.; Rathnayake, R.H.M.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Pushpakumari, O.P.G.; Siriwardhane, K.P.D.; Rathnayake, R.H.M.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)