1. www. Christianity today. Com
2. Hill, Christopher. Milton and the English Revolution. London. Faber and Faber, 1977
3. Milton, John. Complete Prose Works of John Milton Vol II ed. Don Wolfe. New Haven: Yale University Press, 1959.
4. Rumrich, John. "Radical Heterodoxy and Heresy" in A Companion to Milton. Ed. Thomas Corns. Oxford: Blackwell Publishing, 2003.