APA (7th ed.) Citation

Audah, A. (2011). Umar bin Khattab. Pustaka Nasional.

Chicago Style (17th ed.) Citation

Audah, Ali. Umar Bin Khattab. Pustaka Nasional, 2011.

MLA (8th ed.) Citation

Audah, Ali. Umar Bin Khattab. Pustaka Nasional, 2011.

Warning: These citations may not always be 100% accurate.