APA (7th ed.) Citation

Koestler,Arthur. (1979). The sleepwalkers: A history of man's changing vision of the universe. Penguin Books.

Chicago Style (17th ed.) Citation

Koestler,Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. Penguin Books, 1979.

MLA (9th ed.) Citation

Koestler,Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. Penguin Books, 1979.

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