Alan Bristow Helicopter Pioneer: The Autobiography (Chapter 15 — Selling Out, pp. 194-213 & Chapter 17 — Airline Ego Trip, p. 235)
References
^ Bristow, A., and Malone, P. (2012). Alan Bristow Helicopter Pioneer: The Autobiography (Chapter 15 — Selling Out, pp. 194-213 & Chapter 17 — Airline Ego Trip, p. 235), Pen & Sword Books. ISBN 9781848842083 (revised Apr 2012)^ Bristow, A., and Malone, P. (2012). Alan Bristow Helicopter Pioneer: The Autobiography (Chapter 15 — Selling Out, pp. 194-213 & Chapter 17 — Airline Ego Trip, p. 235), Pen & Sword Books. ISBN 9781848842083 (revised Apr 2012)
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