Cita APA (7a ed.)

Koestler, A. (1946). Darkness at noon (5th impression.). Penguin Books.

Cita Chicago Style (17a ed.)

Koestler, Arthur. Darkness at Noon. 5th impression. Harmondsworth [etc.]: Penguin Books, 1946.

Cita MLA (9a ed.)

Koestler, Arthur. Darkness at Noon. 5th impression. Penguin Books, 1946.