Ley, W., & Braun, W. v. (1960). The exploration of mars. The Viking Press.
Lua i Stíl Chicago (17ú heag.)Ley, Willy, agus Wernher von Braun. The Exploration of Mars. New York: The Viking Press, 1960.
Lua MLA (9ú heag.)Ley, Willy, agus Wernher von Braun. The Exploration of Mars. The Viking Press, 1960.
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