1. Lecturer, Faculty of Islamic Studies, Department of Islamic Economic Laws, Universitas Muhammadiyah Surakarta, Indonesia; Faculty of Economics and Business, Department of Islamic Economics, Universitas Airlangga
2. Lecturer, Faculty of Economics and Business, Islamic Economics Department, Universitas Airlangga
3. Student of Faculty of Islamic Studies Universitas Muhammadiyah Surakarta, Faculty of Islamic Studies, Department of Islamic Economic Laws, Universitas Muhammadiyah Surakarta
4. Lecturer, Islamic Economic Laws Department, Universitas Muhammadiyah Surakarta