Cita APA (7th ed.)
Tillich, P. (1952). The courage to be. Yale University Press.
Cita Chicago (17th ed.)
Tillich, Paul. The Courage to Be. New Haven: Yale University Press, 1952.
Cita MLA (9th ed.)
Tillich, Paul. The Courage to Be. Yale University Press, 1952.
Atenció: Aquestes cites poden no estar 100% correctes.