APA (7th ed.) Citation

Ingells, D. J. (1947). They tamed the sky: The triumph of American aviation. D. Appleton-Century Co..

Chicago Style (17th ed.) Citation

Ingells, Douglas J. They Tamed the Sky: The Triumph of American Aviation. New York: D. Appleton-Century Co., 1947.

MLA (9th ed.) Citation

Ingells, Douglas J. They Tamed the Sky: The Triumph of American Aviation. D. Appleton-Century Co., 1947.