| Arts and Humanities | |
| 1500-current | WorldCat (OCLC Bibliographic Database) |
| Austria | |
| 1501-current | Austrian National Library |
| Belgium | |
| 1900-current | Royal Library of Belgium (Koninklijke Bibliotheek) |
| Europe | |
| 1500-current | Gabriel: Gateway to Europe's National Libraries |
| France | |
| Bibliotheque Nationale | |
| Germany | |
| National Library of Germany (Deutsche Bibliothek) | |
| Science | |
| 1500-current | WorldCat (OCLC Bibliographic Database) |
| Social Sciences | |
| 1500-current | WorldCat (OCLC Bibliographic Database) |
| Spain | |
| 1500-current | Automated Catalogue of the Biblioteca Nacional |
| 1900-current | Collective Catalogue of Periodicals (Spain) |
| Switzerland | |
| 1895-current | Helveticat (Swiss National Library) |