Links to chess problem reference sites.
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- 132 Problems and Studies by J. T. Sanderse (no link: unknown new location)
- Also compositions by Sam Loyd and Mark Liburkin.
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- Cleveland Public Library (Ohio, USA)
- The home of the J. G. White chess collection.
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- Harald E. Ballo
- Chess Bibliography (in German).
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- Koninklijke Bibliotheek
- The National Library of the Netherlands (in The Hague) which houses the famous Bibliotheca Van de Linde-Niemeijeriana, a large chess and draughts collection.
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- The Massmann Collection.
- at the Schleswig Holstein Library (in German).
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- The Meson Chess Problem Database.
- A free, online database of over 156,000 chess problems, mostly mates in fewer than six moves.
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- The Problem Database Server (PDB).
- A chess problem data base of mainly helpmates and retros.
Developed by Brian Stephenson. Now maintained by David Hodge.