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    • Gaya APA

    Haekal, M, H. (2002). Umar bin Khattab . Bogor: Pustaka Litera AntarNusa.

    Gaya MLA

    Haekal, Muhammad, Husain. "Umar bin Khattab". Bogor: Pustaka Litera AntarNusa, 2002. Text.