APA (7th ed.) Citation

Ley, W. (1944). Rockets: The future of travel beyond the stratosphere (2. print.). The Viking Press.

Chicago Style (17th ed.) Citation

Ley, Willy. Rockets: The Future of Travel Beyond the Stratosphere. 2. print. New York: The Viking Press, 1944.

MLA (9th ed.) Citation

Ley, Willy. Rockets: The Future of Travel Beyond the Stratosphere. 2. print. The Viking Press, 1944.

Warning: These citations may not always be 100% accurate.