Authors include Tragastch, Peter Henshaw, Bob Currie, Roy Bacon and Ken Hallworth.See Bibliography
The Motor Cycle, Motor Cycling, Classic Motorcycle and many others
More about these magazines at Classic Motorcycle Memorabilia
Motor Sports Magazine have archives dating back to 1920s.
cyclememory.org has an exhaustive listing of French marques and quality scans of period magazines.
motorbike-search-engine.co.uk has been helpful with data on many antique machines.
Encore Plus Chez Alice has many catalogue scans of European marques.
There is an inexhaustive list of the sites visited during research at Bikelinks
raketsport.com has information on numerous models from the prodigious Scandinavian manufacturer Crescent.
The Moped Army has tomes of literature about the mighty moped.
GTU has a large database of German manufacturers.
Wolverhampton History & Heritage Website
Sito Ufficiale Moto di Lombardia has an highly informative catalogue of Italian motorcycles produced in the Milan region. Jampot Simply masses of information about AJS and Matchless
Barnstormers NZ Excellent page from the Shaky Isles.
Aspes Navaho A fine collection of Aspes catalogues, with simply masses of technical information and magazine articles of the period.
Ozebook One of the most venerable motorcycle sites on the internet, it includes a detailed listing of most Russian and almost all known Australian marques.
Jonathon Hayt of Tucson, Arizona, has sent very useful information
on sidecar manufacturers. emnjonh<at>comcast.net
Many articles on NSU and other marques have been contributed by Hartmut Schouwer
Eric Tindal, marque specialist from the VMCC supplied information on the Moto Reve and other machines.
Paul Markham of Australia and Eugene Smith of Arkansas supplied manuals for Heinkel, Durkopp, Progress and others.
Andrew Aborygeniusz of Melbourne, Australia has supplied many rare and interesting images, in particular from Eastern Bloc countries.
Also from Australia, several images of KTM, Vespa and others from Byron Bay Motorcycles
Immagina by Gyp supplied numerous quality illustrations. (cyberium.net)
Jon Bertelli: unique Maserati M2 scooter historical information & photographs.
Horst Mennig: previously undocumented German marque, Denia
German motorcycles, microcars and sidecars JF
The National Motorcycle Museum of Australia
Wanaka Toy & Transport Museum
The Allen Museum of Boston
H & H Classic Auctions UK
Motoclubstoricoconti.it Repository of Italian marque information
The Owen Collection
Nathan Dodge scanned over a hundred pre-digital photos of classic bikes from various museums he made over a period of 20 years.
Webbs Auctions NZ
Robert Livingstone, Puma Archive
Mike Christopher (Ariel, Omega, P&P)
Todd Koehn of Antigo, WI (BMW R100S)
Maratos Antiques, Greece BMWs of the 30s and 40s
Pekka Puoskari, a keen collector and restorer from Finland.
Franco Bonadonna, historical information on the Itom, with images.
Colin Jones, Itom images and information (formerly at /web.onetel.com)
Belgian Motorcycle Rally images courtesy Erard Oldtimersweb
Craig Howell of thecreeper.net
Photographs taken at the DKW Motorrad Club e.V.
A number of quite fine photographs supplied by Gravitat-OFF
Monet Goyon and other images courtesy The Naked Maicomobil
Magni and others by Bill Irwin of TheBikeMuseum.com
Thierry Heurlin supplied images and information on many French machines.
Superia courtesy superiabromfietsen.be
Hans Smid. Information from his motorcycle archive at hanssmid.nl
Atlas Cards whose archive of collector cards has been enormously helpful. More about Atlas here: Classic Motorcycle Memorabilia
Numerous references are made to sites which no longer exist and may only be found by digging deep into the 500 billion pages at the Wayback Machine, some of which have been archived on this site
Open Source information
Archivio dell’Enciclopedia italiana
Istituto per i beni artistici culturali e naturali
Wikipedia including Wikipedia NL
Archive.org Includes a fascinating set of pages from The Motor Cycle of 1922, reproduced with acknowledgement to Mortons Motorcycle Media, holders of the copyright for "The MotorCycle" and "Motorcycling".
Grace's Guide contains a wealth of knowledge concerning British motorcycles.
Sheldon Aubut, the founder of this site.
Apologies to those who are not yet mentioned.