Tham khảo Boeing_XP-4

Ghi chú

  1. ↑ Angelucci 1987, các trang 71–72.
  2. ↑ Dorr and Bishop 1990, các trang 33–34.

Tài liệu

  • Angelucci, Enzo. The American Fighter from 1917 to the present. New York: Orion Books, 1987. ISBN 0-517-56588-9.
  • Dorr, Robert F. and David Donald. Fighters of the United States Air Force. London: Temple, 1990. ISBN 0-600-55094-X.
  • Jones, Lloyd S. U.S. Fighters: Army-Air Force 1925 to 1980s.. Fallbrook, California: Aero Publishers, Inc., 1975. ISBN 0-8168-9200-8.