1. Technical Faculty in Bor, University of Belgrade, Bor, Serbia
2. Department of Finance, Accounting and Economics, Faculty of Economic Sciences, University of Pitesti, Pitesti, Romania
3. Doctoral School, University “Lucian Blaga” Sibiu, Sibiu, Romania
4. Faculty of Economic Sciences, University “Constantin Brancusi”, Tg-Jiu, Romania
5. Faculty of Economics, University of Kragujevac, Kragujevac, Serbia
6. Government College of Management Sciences, Higher Education Commission, Mansehra, Pakistan
7. Faculty of Business Economics and Entrepreneurship, University of Belgrade, Bor, Serbia