Helikoptrar

Hitler's Luftwaffe

Bill Gunston, Tony Wood

The observer's book of aircraft: describing 139 aircraft with 245 illustrations

compiled by William Green ; with silhouettes by Dennis Punnett

Aircraft, 1988-89 (Observers Aircraft)

William Green

Observers Aircraft (Warne Observers)

William Green

Aircraft

William Green ; with silhouettes by Dennis Punnett.

New Observers Book of Aircraft (New Observer's Series)

William Green

RC-helikoptern

Kristian Berggren

Observers Book of Aircraft

William Green

Från Albatros till Viggen: en flygplanmästares minnesbilder

Erich Estulf

The Helicopters (The Epic of Flight)

by Warren R. Young and the editors of Time-Life Books.