Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.