APA (7th ed.) Citation

Davies, R. E. G. (1972). Airlines of the United States since 1914. Putnam.

Chicago Style (17th ed.) Citation

Davies, R. E. G. Airlines of the United States Since 1914. London: Putnam, 1972.

MLA (9th ed.) Citation

Davies, R. E. G. Airlines of the United States Since 1914. Putnam, 1972.

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