1. Chaston J, Lips-Wiersma M. When spirituality meets hierarchy: Leader spirituality as a double-edged sword. Journal of Management, Spirituality & Religion. 2014;12(2):111-128
2. Al-Baidhowi, Nasruddin Abi Said Abdullah bin Umar bin Muhamad Syirazi al-Baidhowi. Tafsir Baidhowi. Beirut: Daril Jil; 1968
3. Al-Alusi, Alamah abi al-Fadl Syihabudin as-Sayid Mahmud al-Alusi al-Baghdadi. Tafsir ruh al-maani. Beirut: Dar al-Fikr; 1987
4. Al-Haj Maulana Fazlul-Karim. Imam Ghazzali’s Ihya ulum-din. New Delhi: Adbdul Naeem for Islamic Book Service; 2005
5. Iehsan MH. Al-manhaj al-rabbani fi bina “wa tarbiat al-mujtama” al-insani wa athar al-taqaddum al-ilmi fih. Kertas disertasi Doktor Falsafah Pengajian Islam. Bangi: Universiti Kebangsaan Malaysia; 2003