APA (7th ed.) Citation

Tillich, P. (1968). A history of Christian thought: From its Judaic and Hellenistic origins to existentialism. Simon and Schuster.

Chicago Style (17th ed.) Citation

Tillich, Paul. A History of Christian Thought: From Its Judaic and Hellenistic Origins to Existentialism. New York London: Simon and Schuster, 1968.

MLA (8th ed.) Citation

Tillich, Paul. A History of Christian Thought: From Its Judaic and Hellenistic Origins to Existentialism. Simon and Schuster, 1968.

Warning: These citations may not always be 100% accurate.