Air Force. Tonbridge, Kent, UK: Air Britain (Historians) Ltd., 1980. . Halley, James J. The Squadrons of the Royal Air Force & Commonwealth, 1981–1988. Tonbridge, Kent, UK: Air Britain (Historians) Ltd., 1988. . Hunt, Leslie. Twenty-one Squadrons: History of the Royal Auxiliary Air Force, 1925–57. London: Garnstone Press, 1972. . (New edition in 1992 by Crécy Publishing, .) Jefford, C.G. RAF Squadrons, a Comprehensive Record of the Movement and Equipment of all RAF Squadrons and their Antecedents since 1912. Shrewsbury, UK: Airlife Publishing Ltd., 1998 (second edition 2001). . Moyes, Philip J.R. Bomber Squadrons of the RAF and their Aircraft. London: Macdonald and Jane's (Publishers) Ltd., 1964 (Second edition 1976). . Rawlings, John D.R. Fighter Squadrons of the RAF and their Aircraft. London: Macdonald and Jane's (Publishers) Ltd., 1969 (Second edition 1976). . External links 504 Squadron The All Party Parliamentary Reserve Forces Group "The RAF Reserves and Auxiliaries" The Royal Air Force Historical Society 2003 Royal Auxiliary Air Force Reserve forces of the United Kingdom 1924 establishments in the United Kingdom Military units and formations established in 1924