APA
Tillich P., . (1963). The eternal now. New York: Charles Scribner's sons.
Chicago
Tillich Paul, . 1963. The eternal now. New York: Charles Scribner's sons.
Harvard
Tillich P., . (1963). The eternal now. New York: Charles Scribner's sons.
MLA
Tillich Paul, . The eternal now. New York: Charles Scribner's sons. 1963.
