APA (7th ed.) Citation

Gregory, H. F. (1944). Anything a horse can do: The story of the helicopter. Reynal & Hitchcock.

Chicago Style (17th ed.) Citation

Gregory, Hollingsworth Franklin. Anything a Horse Can Do: The Story of the Helicopter. New York: Reynal & Hitchcock, 1944.

MLA (9th ed.) Citation

Gregory, Hollingsworth Franklin. Anything a Horse Can Do: The Story of the Helicopter. Reynal & Hitchcock, 1944.