APA (7th ed.) Citation

Balchen, B., & Bergaust, E. (1960). The next fifty years of flight. Viking.

Chicago Style (17th ed.) Citation

Balchen, Bernt, and Erik Bergaust. The Next Fifty Years of Flight. Viking, 1960.

MLA (8th ed.) Citation

Balchen, Bernt, and Erik Bergaust. The Next Fifty Years of Flight. Viking, 1960.

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