1. EBSCO
  2. Index Copernicus
  3. Pro Quest
  4. ASI: Advance Science Index (European Science evaluation center)
  5. COPE
  6. DOAJ
  7. Directory of Open Access Scholarly Resources (ROAD)   
  8. Electronic journals Library (EZB)
  9. Ulrichsweb
  10. BASE
  11. International Committee of Medical Journal Editors (ICMJE)
  12. Pablon
  13. Google Scolar
  14. Magiran
  15. SID
  16. Civilica
  17. Journal Index
  18. CiteFactor
  19. INTERNATIONAL INSTITUTE OF ORGANIZED RESEARCH (I2OR)