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References
- ↑ Bruce, J M (6 April 1956), "The De Havilland D.H.9", Flight, Iliffe and Sons Ltd, p. 386b, archived from the original on 4 November 2012, retrieved 8 March 2011
- ↑ Spooner, Stanley, ed. (4 March 1926). "The A.D.C "Nimbus" Engine" (PDF). Flight: 122. Retrieved 8 March 2011.
- ↑ "The B.H.P. Aero Engine", Flight, vol. XIII, no. 633, p. 88, 3 February 1921, archived from the original on 5 March 2016, retrieved 8 March 2011
- 1 2 page 120, The Aeroplane, 2 February 1921
- 1 2 Douglas R. Taylor, Boxkite to Jet: The Remarkable Career of Frank B. Halford, Rolls-Royce Heritage Trust, 1999.
- 1 2 3 4 5 Lumsden, Alec (2002). British Piston Engines and their Aircraft. Airlife Publishing. pp. 81–86. ISBN 1853102946.
- ↑ Black, Guy (2019). "Background History of the DH9 Aircraft". DH9: From Ruin to Restoration. United Kingdom: Grub Street Publishing. ISBN 9781911621836.
- ↑ R.A.F Field Service Pocket Book. April 1918. pp. 10–11.
- ↑ Bruce, J.M; Noel, Jean (1965). The de Havilland D.H.4. 26. United Kingdom: Profile Publications. ASIN B0007JXD8K.