Barrass, M. B. (2016). "Group No's 200–333". Air of Authority – A History of RAF Organisation. Archived from the original on 15 April 2007. Retrieved 8 November 2016.
Barrass, M. B. (2016). "Group No's 200–333". Air of Authority – A History of RAF Organisation. Archived from the original on 15 April 2007. Retrieved 8 November 2016.