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Ahamad Faosiy, Ogunbado and Yusuf Sani, Abu bakar and Mpawenimana, Abdallah Saidi (2020) UMAR IBN KHATTAB, AN EPITOME OF SERVANT LEADERSHIP: A SUSTAINABLE LESSON FOR CONTEMPORARY LEADERS. Journal of Critical Reviews, 7 (8). pp. 1021-1026. ISSN 2394-5125