1.
Intan S. KEKHALIFAAN UMAR IBN KHATTAB (13-23 H/ 634-644 M). Rihlah [Internet]. 2018Jan.22 [cited 2024Nov.21];5(2):137-50. Available from: https://journal3.uin-alauddin.ac.id/index.php/rihlah/article/view/4167