WINANTO, A. R.; WAFIROTIN, K. Z. Profil Sektor Informal di Kabupaten Ponorogo. Al Tijarah, [S. l.], v. 2, n. 1, p. 53–68, 2016. DOI: 10.21111/tijarah.v2i1.663. Disponível em: https://ejournal.unida.gontor.ac.id/index.php/altijarah/article/view/663. Acesso em: 3 jul. 2024.