Adams, J. L. (1965). Paul Tillich's Philosophy of Culture, Science, and Religion, New York: Harper & Row.
Clayton, John Powell (1965). The Concept of Being in the Theology of Paul Tillich, The Hague: Martinus Nijhoff.
Giesler, N. (2012). Philosophy of Religion, trans. by: Hamidreza Ayatollahi, Tehran: Hekmat Publications. [In Persian]
Grenz, S. J., & Olson, R. E. (1992). 20th Century Theology: God and the World in a Transitional Age, Downers Grove, IL: InterVarsity Press.
Falah, M. M. (2020). “God in the Thought of Paul Tillich”, Metaphysical Studies, Vol. 1, No. 1, Part B, pp. 95–118. [In Persian]
Heidegger, M. (2007). Being and Time, trans. by: Siavash Jamadi, Tehran: Ghoghnoos Publications. [In Persian]
Kegley, C. W., & Bretall, R. W. (Eds.) (1952). The Theology of Paul Tillich, New York: Macmillan.
McDonald, H. D. (1964). “The Symbolic Theology of Paul Tillich”, Scottish Journal of Theology, Vol. 17, Issue 4, pp. 414-430.
McQuarrie, J. (2020). Existentialism, trans. by: Mohammad Saeed Hanaei Kashani, Second Edition, Tehran: Hermes Publications. [In Persian]
Mirsadri, S. S., & Nasiri, M. (2017). “Religious Symbolism from the Viewpoint of Paul Tillich with Emphasis on His Theological-Philosophical System”, Journal of Philosophy of Religion, No. 13, pp. 19–44. [In Persian]
Salehi, M. (2011). “Examining the Relationship between Reason and Faith from Paul Tillich’s Perspective”, Aeen-e Hekmat, Vol. 3, No. 10, pp. 66–100. [In Persian]
Thomas, O. C., & Wondra, E. K. (2002). Introduction to Theology, Third Edition, New York: Morehouse Publishing.
Tillich, P. (1951). Systematic Theology, Vol. 1&2, Chicago: University of Chicago Press.
Tillich, P. (1952). The Courage to Be, New Haven: Yale University Press.
Tillich, P. (1957). Dynamics of Faith, New York: Harper & Row.
Tillich, P. (1959). Theology of Culture, Oxford University Press.
Tillich, P. (1963). The Religious Situation, New York: Harper & Row.
Tillich, Paul (1996). Dynamics of Faith, trans. by: Hossein Norouzi, First Edition, Tehran: Hekmat Publications. [In Persian]
Tillich, Paul (1997). Theology of Culture, trans. by: Morad Farhadpour, First Edition, Tehran: Tarh-e No Publications. [In Persian]
Tillich, Paul (2002). Systematic Theology, trans. by: Hossein Norouzi, Tehran: Hekmat Publications. [In Persian]
Tourani, A., & Tolouei, R. (2011). “The Meaning of Life from the Perspective of Mulla Sadra and Paul Tillich”, Sadra Quarterly, No. 66, pp. 27-38. [In Persian]
Weber, Timothy (2007). Paul Tillich's Philosophy of Culture, Cambridge: Cambridge University Press.
Wood, T. (2007). Paul Tillich, trans. by: Forouzan Rasekhi, First Edition, Tehran: Negah-e Moaser Publishing. [In Persian]