VOLL, J. O. . COMMENTS Re: Muhammad Khalid Masud, SHEHU USUMAN DAN FODIO’S RESTATEMENT OF THE DOCTRINE OF HIJRAH, "ISLAMIC STUDIES", 25, 1(1986).pp. 59-77. Islamic Studies, [S. l.], v. 25, n. 04, p. 463, 1986. Disponível em: http://irigs.iiu.edu.pk:64447/ojs/index.php/islamicstudies/article/view/5828. Acesso em: 13 jan. 2026.