APA (7th ed.) Citation

Wollheim, D. A., Frazetta, F., & Gaughan, J. (1964). Swordsmen in the sky. Ace Books.

Chicago Style (17th ed.) Citation

Wollheim, Donald A., Frank Frazetta, and Jack Gaughan. Swordsmen in the Sky. New York, N.Y.: Ace Books, 1964.

MLA (9th ed.) Citation

Wollheim, Donald A., et al. Swordsmen in the Sky. Ace Books, 1964.