Sources are too numerous to list, but here are some of the principal ones:
Bureau Veritas Annual Registers 1925-1939. Complete set held by New York Public Library.
Incomplete set held by the Bibliotheque National, Paris (1925,1926,1947-) and the Musee de la Air, Le Bourget (1928-)
International Commission for Air Navigation (ICAN)/Commission Internationale de Navigation Aerienne (CINA) weekly Bulletin of Information/Bulletin de Renseignements. 1922-1946 No.s 1-992. ICAO Archives, Montreal
Nachrichten fur Luftfahrer. 1920-1944. Bayerische Staatsbibliothek (Bavarian State Library) Munich
National Archives London
British Library London - India Office Records
The Aircraft Year Book (US). Annual publication 1919-1939. The British Library (1919 to 1922)
The Aircraft Year Book (UK) 1923 The British Library
Flight International Archives
The Aeroplane magazine
The Latin American Aviation Historical Society
Airlines of Latin America since 1919. R.E.G.Davies. Smithsonian Institution Press. ISBN 087474 3583
Airlines of Asia since 1920. R.E.G.Davies. Smithsonian Institution Press. ISBN 085 1778550
U.S. Civil Aircraft Series, Vol 1-7. Joseph P Juptner
Many thanks to the staff of the ICAO library in Montreal, the National Archives at Kew, the British Library, New York Public Library, Bibliotheque Nationale, RAF Museum and Musee de l'Air
And to everyone who has provided information or taken the time to contact me with corrections, in particular Malcolm Fillmore, Ron Church, Arnaldo Correia, Dan Hagedorn at the Museum of Flight, Paul Talbott at the Delta Flight Museum, Claudio Luchina, Marek Lazarz, Austin Brown, Rainer Haufschild, Kees Kort, Rayburn Ray, Daniel Legras, Norman Gray, Theo Wesselink, Robert Gujski, Predrag Miladinovic, Herman Dekker, Coen van den Heuvel, Dr Jesse C. Hillman, Josef Studeny, Brian Lindner, Ken Sandford, Johan Visschedijk, Darryl Gibbs, Philippe Martin, Thomas Mildenberger, Ken Freeze, Valter Battistoni, Pawel Kalafatiuk, Clara Koser, John Faulkner, Ian Andrews, David Garbutt, Ian Atheling, Jean-Claude M. Cailliez, Eduardo Bonvissuto, Eddie Coates, Chris Borough, Prof Owen V Johnson, Ramiro C. Carvalho, Thomas Hubner, Greg Wilsbacher, Alain van den Steene, Airy-Hugues Millet, John Page, Anna Croizet, Hans Kampf, Harry Wade, Nicolas Heitz, Bertrand, Dr Peter Moys, Jason Gould, Schaffner Emmanuel,Arne Bolzmann, Jeff King, Nicolas Heitz, Dave Robinson, Snorry A Tokay, Michael Pomeroy, Terry Baker (ex Air Canada), Peter Graham, Peter Butt and Lilah Pengra.
To Egidio Ferrighi for the Italian updates, Pavel Kloucek for the Czech additions and amendments, Clive Lynch for Australian amendments, George at the National Stinson Club, Gary Beattie, and Fernando Morales for correcting the EC-W19 to EC-W23 series.
To Axel Bree for additions to the WL- German register based on his fathers logbooks, Horst from luftfahrarchive and Ruud Bijman.
Leo P. Murray for a complete re-write of the Irish register.
David McIntosh of the Canadian Museum of Flight.
Lluis Coromina Bertran for updates to the early Spanish Register.
And to Vincent Fay for a complete re-write of the Hungarian and Mexican registers
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The Mesothelioma Center provides resources for those affected.
Historical Canadian Civil Aircraft Register - CAHS publications
Airnet production lists
Official Australian Register
Official Austrian Register
Official Brazilian Register
Official Canadian Register
Official Finnish Register
Official French Register
Recherchen zur Deutschen Luftfahrzeugrolle. 1919-1934. Karl Ries. ISBN 387341 0222
Recherchen zur Osterreichische Luftfahrzeugrolle von 1923-1938. Seagrave. Weishaupt. ISBN 390031 0076
Official Hungarian Register
Unofficial Hungarian Register
Official Indian Register
Official Irish Register
Official Isle of Man Register
Official Latvian Register
Official Luxembourg Register
Official Netherlands Register
Official New Zealand Register
Official Singapore Register
Official Swedish Register
Svensk civil luftfart 1923-1945. Gunther Sollinger. ISBN 9197352705
Official Swiss Register
Official UK Complete Register
Official USA Register
Links to Official registers
Links to Unofficial registers
List of Current aircraft registers
de Havilland production
RWD production
Ernst Heinkel Flugzeuwerke 1922-1932. Volker Koos. Heel. ISBN 3898805026
Junkers Aircraft & Engines 1913-1945. AL Kay. Putnam. ISBN 0851779859
Revolution in the Sky - The Lockheeds of Aviations Golden Age. R.S. Allen. Orion Books. ISBN 0517 566788
The Ford Tri-Motor. William T Larkins. Schiffer Publishing. ISBN 088740 4162
The Stearman Guidebook. Mayborn & Bowers. ISBN 091247 0011
Fairchild Aircraft 1926-1987. Kent A Mitchell. Narkiewicz/Thompson. ISBN 0913322040
Vultee Aircraft 1932-1947. Narkiewicz/Thompson. ISBN 0913322024
Martin Aircraft 1909-1960. Narkiewicz/Thompson. ISBN 0913322032
Les Avions Caudron. Andre Hauet. ISBN 2914017081 and ISBN 291401709X
Les Avions Bernard. Jean Liron. Lariviere. ISBN X000590311
Les Avions Farman. Jean Liron. Lariviere. ISBN X000590214
Les Avions et Hydravions Latecoere. Jean Cuny. Lariviere. ISBN 2907051016
McDonnell Douglas Aircraft since 1920. Francillon. Putnam. ISBN 0851778275
Boeing Aircraft since 1916. Bowers. Putnam.
Curtiss Aircraft 1907-1947. Bowers. Putnam. ISBN0370100298
Lockheed Aircraft since 1913. Francillon. Putnam.
Polish Aircraft 1893-1939. Jerzy B Cynk. Putnam. ISBN 0370000854
Airspeed Aircraft since 1931. Taylor. Putnam. ISBN 0851778488
Armstrong Whitworth Aircraft since 1913. Tapper. Putnam. ISBN 0851778267
Avro Aircraft since 1908. Jackson. Putnam. ISBN 0851778348
Blackburn Aircraft since 1909. Jackson. Putnam. ISBN 0851778305
Bristol Aircraft since 1910. Barnes. Putnam. ISBN 0851778232
De Havilland Aircraft since 1909. Jackson. Putnam. ISBN 085177802X
Fairey Aircraft since 1915. Taylor. Putnam. ISBN 0870212087
Handley Page Aircraft since 1907. Barnes. Putnam. ISBN 0851778038
Hawker Aircraft since 1920. Mason. Putnam. ISBN 0851778399
Shorts Aircraft since 1900. Barnes. Putnam. ISBN 0851778194
Supermarine Aircraft since 1914. Andrews/Morgan. Putnam. ISBN 0851778003
Vickers Aircraft since 1908. Andrews/Morgan. Putnam. ISBN 0851778151