Jane's pocket book 20; Helicopters Jolly Green Giants; US Combat Helicopters Helicopter, An Illustrated History Helicopters Airmobile : the Helicopter War in Vietnam Defence Helicopter World : volume 2 number 1 Defence Helicopter World : volume 2 number 2 Helicopters Soviet helicopters : Design, Development and Tactics helicopters Wings over the world 3. 100 jaar luchtvaarthistorie. Het straalvliegtuig 'The Comet'; Twee Duitse grootmachten; Igor Sikorsky, de vader van de helicopter H23D Raven helicopter, Part 1, Main rotorhead
