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Finn, C. J., ed. (2004). "Chapter 2"(PDF). Air Publication 3003 – A Brief History of the Royal Air Force. HMSO. p. 63. Archived from the original(PDF) on 12 October 2011.
Barrass, Malcolm (29 September 2007). "Air Commodore R Gordon". Air of Authority – A History of RAF Organisation. Archived from the original on 14 February 2008. Retrieved 13 January 2008.
Finn, C. J., ed. (2004). "Chapter 2"(PDF). Air Publication 3003 – A Brief History of the Royal Air Force. HMSO. p. 63. Archived from the original(PDF) on 12 October 2011.
Barrass, Malcolm (29 September 2007). "Air Commodore R Gordon". Air of Authority – A History of RAF Organisation. Archived from the original on 14 February 2008. Retrieved 13 January 2008.