1. Alles, Delphine. 2021. La part des dieux. Religion et relations internationales. Paris: CNRS.
2. Audi, Robert. 2014. Democratic Authority and the Separation of Church and State. Reprint edition. New York: Oxford University Press.
3. Barnett, Michael, Clifford Bob, Nora Fisher Onar, Anne Jenichen, Michael Leigh, and Lucian N. Leustean. 2015. Faith, Freedom, and Foreign Policy: Challenges for the Transatlantic Community. Washington, DC: Transatlantic Academy.
4. Bartulica, Stephen Nikola. 2011. The Christian Roots of Europe in Christopher Dawson’s Philosophy of Culture. Rome: Pontifical Gregorian University.
5. Bruce, Steve. 2013. Secularization: In Defence of an Unfashionable Theory. Oxford: Oxford University Press.