APA (7th ed.) Citation

Ethell, J. L. (1992). Frontiers of flight. Smithsonian Books.

Chicago Style (17th ed.) Citation

Ethell, Jeffrey L. Frontiers of Flight. Washington, D.C.: Smithsonian Books, 1992.

MLA (9th ed.) Citation

Ethell, Jeffrey L. Frontiers of Flight. Smithsonian Books, 1992.

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