1. Allan Knight, John, (2013), Liberalism Versus Postliberalism, the Great Divide in Twentieth-Century Theology, Oxford: Oxford University Press.
2. Brown, Colin, (2005), Christian Philosophy and Faith, translated by Tataous Mikaelian, Tehran: Scientific and Cultural Publication.
3. Capps, W. H., (1995), Religious Studies: The Making of a Discipline, Fortress Press.
4. Cox, James. L., (2028), The Phenomenology of Religion, Prominent Figures, Shaping Factors and the Conseqent Debates, translated by Jafar Fallahi, Tehran: Center.
5. Eliade, Mircea, (2017), Labyrinth of Tough Tests, translated by Arman Salehi, Tehran: Parseh.
6. Fayyazi, Hamed, (2016), Introduction of Translator in Adolf von Harnack; The Origin of the New Testament and The Most Important Consequences of its Emergence, translated by Hamed Fayazi, Qom: University of Religions.
7. Granz, Stanley G., and Elson, Roger A., (2007), Christian Theology in Twentieth Century, translated by Robert Asrian and Michel Aghamalian, Tehran: Roshan.
8. Hamilton, Malcolm, (2008), Sociology of Religion, translated by Mohsen Salasi, Tehran: Sales.
9. Heiler, Friedrich, (2010), "History Religions: A Contrivance for the Interaction of Religions", translated by Jafar Fallahi, Haft Aseman, No. 48, pp. 75-102.
10. Kupit, Dan, (2001), Faith Ocean, translated by Hassan Kamshad, Tehran: Tarh Nou.
11. Lane, Tony, (2001), History of Christian Thought, translated by Robert Asrian, Tehran: Farzan Rouz.
12. Lauer, R. Z., (2003), "Deism", in New Catholic Encyclopedia, 2nd ed. Vol. 4, pp. 615-618.
13. McAfee Brown, Robert, (2003), The Spirit of Protestantism, translated by Fariborz Majidi, Tehran: Contemporary View.
14. McGrath, Alister, (2006), An Introduction to Christian Theology, translated by Isa Dibaj, Tehran: Roshan.
15. Nadimi, Mehrdad and Daneshvar, Yousef, (2018), "Study of Natural Theology in Viewpoints of Karl Barth", Epistemology Theological, No. 20, pp. 81-97.
16. Otto, Rudolf, (2018), East and West Mysticism: A Comparative Analysis of the Essence of Mysticism, translated by Inshallah Rahmati, Tehran: Sophia.
17. Otto, Rudolf, (2001), The Concept of the Sacred, translated by Homayoun Hemmati, Tehran: Naghsh Jahan.
18. Paden, William E., (2005), "Comparative Religion", in Encyclopedia of Religion 2nd ed., Gale.
19. Rudolph, Kurt, (2005), "Religions Geschichtkiche Schule", in Encyclopedia of Religion 2nd ed., Gale.
20. Sharpe, Eric J., (1986), Comparative Religion, A history (2nd Edition), Open Court.
21. Söderblom, Nathan, (1914), "Holiness; General and Primitive", in Encyclopedia of Religion and Ethics (vol. 6), James Hastings (ed.), Edinburg: T. & T. Clark, pp. 736-741
22. Stump, J. B., (2013), "Liberal Theology", in Chad Meister and James Beilby (eds.), The Routledge Companion to Modern Christian Thought, London: Routledge.
23. Sykes, Stone, (1997), Friedrich Schleiermacher, translated by Manouchehr Sanei Darehbidi, Tehran: Garous.
24. Weaver, Mary. Jo, (2002), Introduction to Christianity, translated by Hassan Ghanbari, Qom: Religions Publication.
25. Weisheipl, J. A., (2003), "Neo-Scholasticism and Neothomism", in New Catholic Encyclopedia, 2nd ed. Vol. 10, p. 244.
26. Wilson, John E., (2007), Introduction to Modern Theology; Trajectories in the German Tradition, Westminster John Knox Press.