KUSUMA, Kumara Adji. Pengantar Sistem Ekonomi Islam. Umsida Press, [S. l.], p. 1–166, 2021. DOI: 10.21070/2019/978-602-5914-90-4. Disponível em: https://press.umsida.ac.id/index.php/umsidapress/article/view/978-602-5914-90-4. Acesso em: 21 jun. 2025.