Gibran Maulana. Umar Bin Khattab: Sang Pemberani Yang Sederhana. Surabaya: Cahaya Agency.
Chicago Style CitationGibran Maulana. Umar Bin Khattab: Sang Pemberani Yang Sederhana. Surabaya: Cahaya Agency.
MLA CitationGibran Maulana. Umar Bin Khattab: Sang Pemberani Yang Sederhana. Surabaya: Cahaya Agency.
Warning: These citations may not always be 100% accurate.