Liyanagama, N.L.; Nugawela, R.C.W.M.R.A.; Attanayaka, D.P.S.T.G.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Nanayakkara, K.G.M.; Wijetunge, W.A.D.S.(Department of Business Management, Faculty of Business Studies and Finance, Wayamba University of Sri Lanka. Kuliyapitiya, 2010)
Perera, H.S.R.; Udugama, J.M.M.; Jayasinghe-Mudalige, U.K.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Serasinghe, S.A.A.Y.P.; Anjalee, G.H.I.; Athauda, A.M.T.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Mirando, J.S.; Fernando, T.H.P.S.; Nugawela, A.; Wijayaratne, C.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)