Jayawardana, K.N.A.; Ranaweera, B.; Abeysekara, N.N.R.; Kelaniyangoda, D.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Bandara, E.G.C.D.; Mudalige, Jayasinghe U.K.; Udugama, J.M.M.; Attanayake, A.M.C.M.; Edirisinghe, J.C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)