SCOPUS – https://www.scopus.com
EBSCO – https://www.ebsco.com/
Hrčak – https://hrcak.srce.hr/crkva-u-svijetu
ERIH-PLUS – https://kanalregister.hkdir.no/
Croatian Web Archive, National and University Library in Zagreb - https://haw.nsk.hr/en/
The DOI® System – https://www.doi.org/
Crossref – https://search.crossref.org/
Google znalac – https://scholar.google.hr/
DOAJ - https://doaj.org/