Kahatapitiya, K.P.K.D.; Kodituwakku, D.S.; Jayawardhana, M.N.; Muhandiramge, K.M.R.R.; Gunawardhana, K.(Social Statistics Students’ Association, Department of Economics, University of Kelaniya, 2015)
Kodituwakku, D.S.; Dulani, K.P.K.; Jayawardena, M.N.; Muhandiramge, K.M.R.R.; Maduwanthi, G.H.H.S.(Social Statistics Students’ Association, Department of Economics, University of Kelaniya, 2015)