Cita APA (7th ed.)

Koestler, A. (1959). The sleepwalkers: A history of man's changing vision of the universe. Grosset & Dunlap.

Cita Chicago (17th ed.)

Koestler, Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. New York: Grosset & Dunlap, 1959.

Cita MLA (9th ed.)

Koestler, Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. Grosset & Dunlap, 1959.