إبراهيم عبد الله ر. Thee confrontation of the Khalefa Omar Bin Al-kattab ( to be satisfied with Allah ) to the crisis of ( Am Al-ramada ) 18A.H / 639A.D. College of Basic Education Research Journal, [S. l.], v. 11, n. 4, p. 339–361, 2012. Disponível em: https://moss.uomosul.edu.iq/index.php/berj/article/view/39126. Acesso em: 26 oct. 2025.