Harper, H. (1946). Winged world: The coming of the air age. Scientific Book Club.
Cita Chicago (17th ed.)Harper, Harry. Winged World: The Coming of the Air Age. London: Scientific Book Club, 1946.
Cita MLA (8th ed.)Harper, Harry. Winged World: The Coming of the Air Age. Scientific Book Club, 1946.
Atenció: Aquestes cites poden no estar 100% correctes.