Koestler, A. (1959). The sleepwalkers: A history of man's changing vision of the universe. Grosset & Dunlap.
Lua i Stíl Chicago (17ú heag.)Koestler, Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. New York: Grosset & Dunlap, 1959.
Lua MLA (9ú heag.)Koestler, Arthur. The Sleepwalkers: A History of Man's Changing Vision of the Universe. Grosset & Dunlap, 1959.
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