APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Velikovsky, Immanuel. Worlds in Collision. New York: Macmillan, 1950.

MLA (9th ed.) Citation

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

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