Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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