Air & Space magazine, 1 September 2009.
==Glej tudi==* Sikorsky SH-60 Seahawk* Eurocopter X3* Kamov Ka-92* Mil Mi-X1* Piasecki 16H* Sikorsky X2==Sklici in reference====Zunanje povezave==* Jane's All The World's Aircraft - X-49A* "High Speed Helicopter set for first flight in June" article on FlightGlobal.com* Rotor and Wing Cover Story Dec 2007* Vertiflite Cover Story Winter 2007* Aerospace Testing International Dec 2007* Boeing Eyes X-49A Technology for Apache Attack Helicopter* "Hot-Rod Helicopters".