Istikhlaf Abi Bakr al-Siddiq radiyallah'anh - Muhammad, Jamal'Abd al-Hadi; Jum'ah, Wafa' Muhammad Rif'at (al-Qahirah : Dar al-Salam, 2009)
Keywords: Abu Bakr, -- Caliph, -- d. 634; Islamic Empire -- History -- 622-661