OPAC italiani

• Biblioteca Nazionale Centrale
  • https://opac.sbn.it/
• Biblioteca Nazionale Centrale – Firenze
  • http://www.bncf.firenze.sbn.it/
• Biblioteca Apostolica Vaticana
  • https://www.vatlib.it/

Cataloghi delle biblioteche della rete URBS

• Bibliotèque Nationale de France
  • http://www.bnf.fr/fr/acc/x.accueil.html
• Brithish Library
  • http://www.bl.uk/
• Catalogo Italiano Periodici (ACNP)
• https://acnpsearch.unibo.it/
• Library of Congress
  • https://catalog.loc.gov/
• The New York Public Library
  • https://www.nypl.org/
• Deutsche National Bibliotek
  • http://www.dnb.de/DE/Home/home_node.html
• Biblioteca Nacional de Espana
  • http://www.bne.es/es/Inicio/index.html
• Internet Archive
  • https://archive.org/about/
• The European Library
  • https://www.theeuropeanlibrary.org/
• Karlsruhe Virtueller Katalog
  • https://www.bibliothek.kit.edu/kvk-hilfe.php
• World Cat
  • https://search.worldcat.org/it