APA (7th ed.) Citation

Velikovsky, I. (1950). Worlds in collision. Doubleday.

Chicago Style (17th ed.) Citation

Velikovsky, Immanuel. Worlds in Collision. Garden City, N.Y.: Doubleday, 1950.

MLA (9th ed.) Citation

Velikovsky, Immanuel. Worlds in Collision. Doubleday, 1950.