Catalogo italiano dei periodici: Union catalogue of Italian libraries periodicals and the articles inside them.
MLA International Bibliography: Produced by the Modern Languages Association. Citations for journals, books, collections of essays, conference proceedings, etc., published worldwide.
L'Indice de libri del mese: a monthly publication of cultural information
SOLO: Oxford's union catalogue for the holdings of university, departmental and college libraries as well as e-resources available to Oxford researchers.
JISC Library Hub Discover: Union catalogue for the holdings of over 100 UK university and specialist libraries.
Servizio Bibliothecario Nazionale (SBN): Union catalogue of Italian libraries.
WorldCat: Union catalogue of major research universities worldwide with an emphasis on US university libraries.