APA (7th ed.) Citation

Ley, W., & Braun, W. v. (1960). The exploration of mars. The Viking Press.

Chicago Style (17th ed.) Citation

Ley, Willy, and Wernher von Braun. The Exploration of Mars. New York: The Viking Press, 1960.

MLA (9th ed.) Citation

Ley, Willy, and Wernher von Braun. The Exploration of Mars. The Viking Press, 1960.