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, Department of Islamic Economics, Universitas Airlangga
3. Student of a Bachelor’s Degree, Faculty of Islamic Studies, Department of Islamic Economic Laws, Universitas Muhammadiyah Surakarta
4. Lecturer, Faculty of Islamic Studies, Department of Islamic Economic Laws, Universitas Muhammadiyah Surakarta