Tawheed (http://www.usc.edu/dept/MSA/fundamentals/tawheed/abdulwahab/index.html) is considered the foundation upon which the 'five pillars (http://www.usc.edu/dept/MSA/fundamentals/pillars/)' of Islam are built. An indepth analysis of the subject is dealt with by Abu Ameenah Bilal Philips in his english work 'The Fundamentals of Tawheed (http://www.usc.edu/dept/MSA/fundamentals/tawheed/abutaw/abutaw_1.html) (Islamic Monotheism)'. and may be considered crucial when considering the 99 names of God and thus Islamic Godforms.
- Al-Sadi, Allamah 'Abd al-Rahman al-Sadi, 2003, An Explanation of Muhammad Ibn 'Adb al Wahhab's Kitab al-Tawhid, Al-Hidayah Publishing, Birmingham, UK.
- Philips, Abu Ameenah Bilal, 1997, The Fundamentals of Tawheed (Islamic Monotheism), International Islamic Publishing House, Riyadh, KSA.
- Al Ghazali, Abu Hamid, 1992, The Ninety-Nine Names of God, translated by Burrel, D. B., and Daher, N., Islamic Texts Society, Cambridge, UK.