Harper, H. (1946). Winged world: The coming of the air age. Scientific Book Club.
Citazione stile Chigago Style (17a edizione)Harper, Harry. Winged World: The Coming of the Air Age. London: Scientific Book Club, 1946.
Citatione MLA (8a ed.)Harper, Harry. Winged World: The Coming of the Air Age. Scientific Book Club, 1946.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.