APA (7th ed.) Citation

Koestler, A. (1964). The act of creation. Penguin Books.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Act of Creation. Harmondsworth, M1ddlesex, Eng: Penguin Books, 1964.

MLA (9th ed.) Citation

Koestler, Arthur. The Act of Creation. Penguin Books, 1964.