عمر الشاهين م. Roots of Extremism and its importantThe Rise of the state of the Arabs before Islam. College of Basic Education Research Journal, [S. l.], v. 6, n. 2, p. 221–242, 2007. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/38186. Acesso em: 26 oct. 2025.