- Academia
- BASE
- CORE
- CrossRef
- Dimensions
- Dissemin (finding articles by Article Title)
- DOAJ (Directory of Open Access Journals)
- EBSCO host
- ERIH PLUS - The European Reference Index for the Humanities and the Social Sciences (2022-09-02)
- Fatcat
- GIFT - Global Information Full Text, Switzerland
- Google Scholar
- iDiscover (University of Cambridge)
- Index Copernicus (ICV 2020: 85.97)
- Information Matrix for the Analysis of Journals (MIAR)
- ISSN National Centre
- Korea Open Access platform for Researchers
- LENS
- Neliti
- OAJI - Open Academic Journals Index is a full-text database of open-access scientific journals
- OpenAIRE
- Open Archives
- Open Ukrainian Citation Index
- Public Knowledge Project
- Publons
- ResearchBib
- Research4Life
- ScienceGate Academic Search Engine
- Scilit
- Semantic Scholar (finding articles by Article Title)
- Sherpa Romeo
- Socionet
- UNPAYWALL
- Ulrichsweb™ - Ulrich's Global Serials Directory

Libraries:
- Biblioteka Narodowa (Warsaw)
- Bibliotheks Verbund Bayern (Germany)
- Harvard Library
- PHSG University of Education St.Gallen
- University of Saskatchewan Library (Canada)
- University of Washington Libraries (USA)
- University of South Australia Library
- World Cat

Digital archiving:
- PKP Preservation Network (PKP PN)