HAMAD, S. J. The Scientific Efforts of the Caliph Omer Bin Al-Khatab in Muslim Civilization (Visions and Dreams as an example) (13H-24H/634M-644M). Journal of Tikrit University for Humanities, [S. l.], v. 28, n. 3, 2, p. 402–418, 2021. DOI: 10.25130/jtuh.28.3.2.2021.23. Disponível em: https://jtuh.org/index.php/jtuh/article/view/1680. Acesso em: 13 jun. 2026.