SALEH, O. A. Seals of the Rightly-Guided Caliphs and Their Signs. Journal of Tikrit University for Humanities, [S. l.], v. 27, n. 2, p. 300–330, 2020. DOI: 10.25130/jtuh.27.2.2020.14. Disponível em: https://jtuh.org/index.php/jtuh/article/view/1178. Acesso em: 15 jul. 2026.