Tham khảo Focke-Wulf_Fw_57

  1. ↑ Green and Swanborough 1994, p. 213.
  2. ↑ Green 1972, p. 178.
  • Green, William. Warplanes of the Third Reich. New York:Doubleday, 1972. ISBN 0-385-05782-2.
  • Green, William and Gordon Swanborough. The Complete Book of Fighters. New York, Smithmark, 1994. ISBN 0-8317-3939-8.
  • Herwig, D and H. Rode.Luftwaffe Secret Projects - Ground Attack & Special Purpose Aircraft. ISBN 1-85780-150-4