Hughes HK-1 (H-4) Flying Boat Manual
U.S. War Department | Engels | softcover | 170 blz | 2009
Howard's Whirlybirds : Howard Hughes' Amazing Pioneering Helicopter Exploits
Donald J. Porter | Engels | hardcover | 240 blz | 2013
AH-64 Apache
Christian Rastätter | Duits | hardcover | 224 blz | 2021
AH-64 Apache Attack Helicopter
Headquarters Department of the Army | Engels | softcover | 656 blz | 2011
The Apache in European Service
Darren Willmin | Engels | softcover | 96 blz | 2016