ABDUL MALEK, N.; MOHD ARSHAD, M. N. The Informal Economy: A Neglected Area in Islamic Economics. International Journal of Economics, Management and Accounting, [S. l.], v. 25, n. 2, p. 285–314, 2017. Disponível em: https://journals.iium.edu.my/enmjournal/index.php/enmj/article/view/452. Acesso em: 3 feb. 2023.