Aéroport de LympneSalamander, 1976 (ISBN 0-600-33144-X), « De Havilland Airco D.H.4. »« 160 hp BHP (Beardmore-Halford-Pullinger) engine, » (en) David W. Lee, Action Stations
Aeroplane MonthlyMonthly, No.202 - Février 1990 Bye bye Blackbird, CWH Lancaster in detail, Beardmore Inverness, Testing the Blackburn Skua, What did happen to the Duke of