Abu Munshar, M. Y. “DID ’UMAR IBN AL-KHATTAB ACT AGAINST ISLAM: BANI TAGHLIB TRIBE AS A CASE STUDY”. Journal of Al-Tamaddun, vol. 5, no. 1, Dec. 2010, pp. 25-32, http://ojie.um.edu.my/index.php/JAT/article/view/8535.