Senevirathne, L.P.S.S.G.; Jayasinghe-Mudalige, U.K.; Guruge, T.P.S.R.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Galagoda, R.P.W.M.R.R.K.B.; Gajanayake, K.G.M.C.P.B.; Silva, D.A.C.S.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Tennakoon, W.D.N.S.M.; Arachchi, R.S.S.W.(Department of Business Management, Faculty of Business Studies and Finance, Wayamba University of Sri Lanka. Kuliyapitiya, 2010)