1. Adams, R. (1972). Must God create the best? Philosophical Review, 81, 317–332.
2. Bavinck, H. (2004). Reformed dogmatics: God and creation, vol. 2. In J. Bolt (Ed.) & J. Vriend (Trans.). Grand Rapids: Baker Academic.
3. Couenhoven, J. (2012). The necessities of perfect freedom. International Journal of Systematic Theology, 14, 396–419.
4. Feinberg, J. (2001). No one like Him: the doctrine of God. Wheaton: Crossway Books.
5. Frame, J. (2002). The doctrine of God. Phillipsburg: Presbyterian and Reformed.