- EBSCO (U.S.)
- Index Copernicus (Poland)
- Ulrich’s Periodicals Directory (ProQuest, U.S.)
- Journal TOCS (UK)
- PKP Open Archives Harvester (Canada)
- Bielefeld Academic Search Engine (Germany)
- ElektronischeZeitschriftenbibliothek EZB (Germany)
- SCI-Edge (U.S.)
- Open J-Gate (India)
- OCLC World Cat (United States)
- Universe Digital Library (Malaysia)
- New Jour (Georgetown University Library, U.S.)
- Google Scholar
