The main sources of our documentation (records, material, photos, documents, publications, estates of deceased personalities etc. etc.) were and are

• the Billiard Museum and Billiard Archive Heinrich Weingartner, Vienna
• the billiard collection and Billiard Archive Dieter Haase, Kassel

In addition, there are numerous documents and photos that were kindly made available to me by numerous billiard players, officials and billiard enthusiasts.

Not to be forgotten as sources are the international and national billiard federations such as
UMB, CEB, DBU, BSVÖ, FFB, KNBB, DBBU, Fibis.

In addition, there is extensive material from Manfred Hekerle (Vienna), Cees Sprangers (Dongen),
Kurt Dahlhaus (Hattingen), Ingrid Englbrecht (Vienna) and Piet Steenis (Vianen).

The following list of helpers who provided documents and photos is compiled to the best of my knowledge and belief. If I have not listed anyone, please accept my apologies and I will correct this as soon as possible.

Unfortunately, due to the enormous amount of material, it can easily happen that I have forgotten to mention someone. Sorry!

Helga Ackermann (Touch-Magazin DE)
Stefan Andres (Gelsenkirchen)
Dr. Werner Bayer (Elversberg) (†)
Ernst Bechert (Essen)
Jack Ben-Nathan (London)
Carlos Borell (Spain, Switzerland)
Axel Büscher (Cosfeld)
Robert Byrne (Dubuque – USA)
Torsten Danielsson (Denmark)
Andreas Efler (Wien)
Dieter Ernst (Dülmen)
Rolf Feige (Iserlohn) (†)
Luca Marzio Garavaglia (Milano)
Jean-Pierre Giraud (Lille)
Thomas Hähne (Langen)
Sten Hebert (Sweden)
Johny Houtch (Bivange)
Guy Hybrechts (Brussels)
Harry Inderhees (Groß Gaglow)
Bob Jewett (Santa Clara – USA)
Ralf Laakmann (Kevelaer) (†)
Tim Lawrence (Columbus – USA)
Stefano Malacrita (Roma)
Edmund Mevissen (Bremen)
Jan Osterloh (Hamburg)
Robert Richter (Essen) (†)
Hans Ringel (Wien) (†)
Wolfgang Rittmann (Bottrop) (†)
Franz Ruppert (Vienna)
Sjaak Rutten (Nijmegen) (†)
Erhard Schran (Marl)
Rainer Selgrath (St. Wendel)
Bernd Singer (Ingolstadt)
Charlotte Sørensen (Denmark)
Peter Sporer (Murnau)
Frank Spruzina (Hildesheim)
Jos Reypens (NL)
George Saccas (GR)
Petra Scholze (Vienna)
Filip Steurs (Anvers)
Peter Stöger (Vienna)
August Tiedtke (†) Gert Tiedtke (Bendorf) (†)
Bert van Manen (Ede, NL)
Gabrio Volante
Horst Wiedemann (Essen)
Diane Wild (Lausanne)
Heiko Wolter (Bottrop)
Marco Zanetti (Bolzano)
Christian Zöllner (Magdeburg)

Not to be forgotten among the sources are the holdings of the major international and national libraries (e.g. BNF Paris, Anno Vienna, Library of Congress Washington, British Library London, DNB Leipzig, Public Library New York etc. etc.).