EL-HIBRI, tayeb. ʿUmar b. al-Khaṭṭāb and the Abbasids. JAOS, [S. l.], v. 136, n. 4, p. 763–783, 2021. DOI: 10.7817/jameroriesoci.136.4.0763. Disponível em: https://lockwoodonlinejournals.com/index.php/jaos/article/view/1338. Acesso em: 18 jul. 2024.