Tillich, P. (2000). The courage to be (Second edition.). Yale University Press.
芝加哥风格引文Tillich, Paul. The Courage to Be. Second edition. New Haven: Yale University Press, 2000.
MLA引文Tillich, Paul. The Courage to Be. Second edition. Yale University Press, 2000.
警告：这些引文格式不一定是100％准确.