
| 1. Web of Science |
| 2. EBSCO Publishing Electronic Databases |
| 3. Google Scholar |
| 4. NLM Catalog |
| 5. University of Hong Kong Libraries |
| 6. IIFS – International Impact Factor Services |
| 7. Academic Journals Databases |
| 8. The British Library |
| 9. Directory of Research Journal Indexing |
| 10. National Knowledge Resource Consortium |
| 11. University of Michigan-M Library |
| 12. San Jose State University, Dr Luther King Jr Library |
| 13. Indiana University, Bloomington |
| 14. OhioLINK |
| 15. Harold B. Lee Library |
| 16. WZB Berlin Electronic Journals Library |
| 17. Fudan University Library |
| 18. GENAMICS Journal Seek |
| 19. USC libraries – University OF California |
| 20. Katalog plus - Universitat Hamburg |
| 21. University of Leipzig Library |
| 22. UIC Library of Health Sciences, Chicago |
| 23. Sherpa Romeo |
| 24. Forschungszentrum Julich – Central Library |
| 25. Cook Library – Western Theological Seminary |
