Chanika, W.W.D.; Mudalige, Jayasinghe U.K.; Udugama, J.M.M.; Edirisinghe, J.C.; Ikram, S.M.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Dananjaya, M.H.; Herath, H.M.I.K.; Gajanayake, B.; Wijebandara, D.M.D.I.; Pathirana, K.P.A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)