APA (7th ed.) Citation

Shalabi, A. M., Harahap, K. A., & Faozan. (2008). The great leader of Umar bin Al-Khathab. Pustaka Al-Kautsar.

Chicago Style (17th ed.) Citation

Shalabi, Ali Muhammad, Khoirul Amru Harahap, and Faozan. The Great Leader of Umar Bin Al-Khathab. Jakarta Timur: Pustaka Al-Kautsar, 2008.

MLA (8th ed.) Citation

Shalabi, Ali Muhammad, et al. The Great Leader of Umar Bin Al-Khathab. Pustaka Al-Kautsar, 2008.