APA Style

Tillich, P., Braaten, C, E. (1968). A History of Christian Thought : From It's Judaic and Hellenistic Origins to Existentialism . New York, NY: A Touchstone Book.

MLA Style

Tillich, Paul., Braaten, Carl, E.. "A History of Christian Thought : From It's Judaic and Hellenistic Origins to Existentialism". New York, NY: A Touchstone Book, 1968. Text.