Szablon:Forgotten Fighters 2
Peter M. Bowers: Forgotten Fighters/2 and Experimental Aircraft U.S. Army 1918-1941. Arco Publishing, 1971. ISBN 978-0668024037.
Peter M. Bowers: Forgotten Fighters/2 and Experimental Aircraft U.S. Army 1918-1941. Arco Publishing, 1971. ISBN 978-0668024037. Brak numerów stron w książce