Balchen, B. (1960). The Next Fifty Years of Flight. New York: The Viking.
Chicago Style aipamenaBalchen, Bernt. The Next Fifty Years of Flight. New York: The Viking, 1960.
MLA aipamenaBalchen, Bernt. The Next Fifty Years of Flight. New York: The Viking, 1960.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.