BÖWERING, G. . J. CHRISTOPH BÜRGEL, J. Cristoph Bürgel. STEPPE IM STAUBKORN (Texte aus der Urdu-Dichtung Muhammad Iqbals) . Islamic Studies, [S. l.], v. 25, n. 01, p. 97–99, 1986. Disponível em: http://irigs.iiu.edu.pk:64447/ojs/index.php/islamicstudies/article/view/5554. Acesso em: 8 dec. 2025.