Judul Buku : The Great of Two Umars : Kisah Hidup Dua Khalifah Paling Legendaris: Umar ibn al-Khathab dan Umar ibn Abdul Aziz Penulis : Fuad Abdurrahman Penerbit : Zaman Terbit : Juni 2013 Tebal : 346 halaman ISBN : 9786021791905