APA (7th ed.) Citation

Ridzuan Adam. (2010). Khalifah Kedua Kaum Mukmin: Umar Al-Khattab R.A. Nikaz Publications.

Chicago Style (17th ed.) Citation

Ridzuan Adam. Khalifah Kedua Kaum Mukmin: Umar Al-Khattab R.A. Selangor: Nikaz Publications, 2010.

MLA (9th ed.) Citation

Ridzuan Adam. Khalifah Kedua Kaum Mukmin: Umar Al-Khattab R.A. Nikaz Publications, 2010.

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