Herath, H.M.A.; Atugoda, S.(Department of Business Management, Faculty of Business Studies and Finance, Wayamba University of Sri Lanka. Kuliyapitiya, 2010)
Dhammika, K.A.S.; Ahmad, F.B.; Sam, T.L.(Department of Business Management, Faculty of Business Studies and Finance, Wayamba University of Sri Lanka. Kuliyapitiya, 2012)