Library of Congress Online Catalogue
KATALOZI I OSTALI IZVORI INFORMACIJA U SVIJETU
Knjižnični katalozi
Kooperativni online bibliografski sustav Cobiss
The British Library Catalogue
Katalog der Deutschen Nationalbibliothek
Ostali izvori informacija
The Metropolitan
Museum of Art
Centar za online
baze podataka
The Directory of Open Access Repositories – OpenDOAR
Directory of Open Access Journals – DOAJ
Open Access
Directory
Public Library
of Science