Iva Inayatul Ilahiyah and Muhammad Nur Salim, “KARAKTERISTIK KEPEMIMPINAN KHULAFA AR-RASYIDIN: Abu Bakar As-shiddiq, Umar Bin Khattab, Utsman Bin Affan, Ali Bin Abi Thalib”, EL-Islam, vol. 1, no. 01, pp. 43–68, Jan. 2019.