APA (7th ed.) Citation

Koestler, A. (1951). The age of longing. Macmillan.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Age of Longing. New York: Macmillan, 1951.

MLA (9th ed.) Citation

Koestler, Arthur. The Age of Longing. Macmillan, 1951.

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