APA (7th ed.) Citation

Chandler, A. B., & Petaja, E. (1965). Space mercenaries. Ace Books.

Chicago Style (17th ed.) Citation

Chandler, A. Bertram, and Emil Petaja. Space Mercenaries. New York: Ace Books, 1965.

MLA (9th ed.) Citation

Chandler, A. Bertram, and Emil Petaja. Space Mercenaries. Ace Books, 1965.