Tham khảo Bell 400 TwinRanger

  1. 1 2 3 Frawley, Gerard: The International Directiory of Civil Aircraft, 2003-2004, page 43. Aerospace Publications Pty Ltd, 2003. ISBN 1-875671-58-7
  2. 1 2 Apostolo, Giorgio; Elfan ap Rees (1984). The Illustrated Encyclopedia of Helicopters. New York, NY, USA: Bonanza Books. tr. 50. ISBN 0-517-43935-2.