HAMAD, SAFFA JASIM. “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 28, no. 3, 2 (March 2, 2021): 402–418. Accessed June 13, 2026. https://jtuh.org/index.php/jtuh/article/view/1680.