- Ulrichsweb™ - Ulrich's Global Serials Directory
- Google Scholar
- Academia
- Cross Ref
- Biblioteka Narodowa (Warsaw)
- ISSN National Centre (ROAD)
- Index Copernicus
- Public Knowledge Project
- ResearchBib
- World Cat
- SciLit
- BASE
- EuroPub
- World Catalogue of Scientific Journals (WCOSJ)
- Eurasian Scientific Journal Index (ESJI)
- UNPAYWALL
- Socionet
- Dimensions
- OpenAIRE
- LENS
- Microsoft Academic (finding articles by DOI)
- CORE
- Korea Open Access platform for Researchers
- Open Ukrainian Citation Index
- Open Archives
- Polska Bibliografia Naukowa
- Dissemin (finding articles by Article Title)
- Semantic Scholar (finding articles by Article Title)
- Fatcat
- Neliti
- Sherpa Romeo
- University of Washington Libraries (USA)
- PHSG University of Education St.Gallen
- Research4Life
- University of South Australia Library
- Central and Eastern European Online Library CEEOL (Germany)
- iDiscover (University of Cambridge)

Digital archiving:
- PKP Preservation Network (PKP PN)