APA (7th ed.) Citation

Koestler, A. (1964). Darkness at noon. Penguin Books in association with Jonathan Cape.

Chicago Style (17th ed.) Citation

Koestler, Arthur. Darkness at Noon. Harmondsworth, Eng.: Penguin Books in association with Jonathan Cape, 1964.

MLA (9th ed.) Citation

Koestler, Arthur. Darkness at Noon. Penguin Books in association with Jonathan Cape, 1964.

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