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    • Gaya APA

    Sunarto, A. (2014). Biografi Umar Bin Khaththab R.A. (Cet 1). Surabaya: Aulia.

    Gaya MLA

    Sunarto, Achmad. "Biografi Umar Bin Khaththab R.A.". Cet 1 Surabaya: Aulia, 2014. Text.