Tillich, P., & Gomes, P. J. (2000). The courage to be (2nd ed.). Yale University Press.

Tillich, Paul, and Peter J. Gomes. The Courage to Be. 2nd ed. New Haven: Yale University Press, 2000.

Tillich, Paul, and Peter J. Gomes. The Courage to Be. 2nd ed. Yale University Press, 2000.