1. Doctoral Program Student in Management Science, Faculty of Economics and Business, Universitas Padjadjaran [Padjadjaran University]; Faculty of Economics and Business, Universitas Muhammadiyah Sumatera Utara [Muhammadiyah University of North Sumatra]
2. Dr., Associate Professor, Faculty of Economics and Business, Universitas Padjadjaran [Padjadjaran University]
3. Ph.D., Senior Lecturer, Faculty of Economics and Business, Universitas Padjadjaran [Padjadjaran University]