دريد خالد ع. Educational Principles in the Biography of prince of Muslims Omar Bin Al-Khatab (May Allah bless Him). College of Basic Education Research Journal, [S. l.], v. 2, n. 3, p. 1–15, 2006. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/38967. Acesso em: 26 oct. 2025.