APA (7th ed.) Citation

Tillich, P. (1968). A history of Christian thought ([2d ed., rev.). Harper & Row.

Chicago Style (17th ed.) Citation

Tillich, Paul. A History of Christian Thought. [2d ed., rev. New York: Harper & Row, 1968.

MLA (9th ed.) Citation

Tillich, Paul. A History of Christian Thought. [2d ed., rev. Harper & Row, 1968.