The Greatest Leader of Umar Bin Al-Khathab / Ash-Shalabi, Muhammad Khoirul Amru Harahap,Lc.M.Ag Akhmad Faozan,Lc.M.Ag M.Yasir Abd Muthalib Lc Yasir Maqosid Al-Azhary,Lc. text Jakarta : Pustaka Al-Kautsar, 2008 ind Islam - Biografi URN:ISBN:978-979-592-442-5