APA (7th ed.) Citation

Leinster, M., Stine, G. H., Jenkins, W., Correy, L., Schulz, R., & Valigursky, E. (1956). The forgotten planet. Ace Books.

Chicago Style (17th ed.) Citation

Leinster, Murray, G. Harry Stine, Will Jenkins, Lee Correy, Robert Schulz, and Ed Valigursky. The Forgotten Planet. New York: Ace Books, 1956.

MLA (9th ed.) Citation

Leinster, Murray, et al. The Forgotten Planet. Ace Books, 1956.