Hubschrauber

Winnie and Wilbur: the Amazing Pumpkin

Valerie Thomas, Paul Korky

Apache dawn: always outnumbered, never outgunned

Damien Lewis.

Pioneers of the air

by Molly Burkett.

Die deutschen Hubschrauber: 1928-1945

von Heinz J. Nowarra

One hell of a ride: how Craig Dobbin built the world's largest helicopter company

John Lawrence Reynolds

Special Operations Aviation: The Men and Machines of the Elite Units

Patrick H. F. Allen

Helicopter theory

Wayne Johnson.

Deutsche Hubschrauber vor 1945

Manfred Griehl ; Joachim Dressel

Wings, Wheels and Sails (Tell Me About)

Tom Stacy

Helicopters before helicopters

E.K. Liberatore.