2. Garuda (Garba Rujukan Digital)
3. Sherpa Romeo
4. Indonesia OneSearch by PERPUSNAS
5. Neliti
6. Base (Bielefeld Academic Search Engine)
7. ROAD (Directory of Open Access Scholarly Resources)
8. OpenAlex
9. Crossref
10. Dimensions
11. Scilit
12. Moraref
13. Technical University of Denmark
14. University of Victoria Libraries
15. OCLC Worldcat
16. Open Archives
17. SUDOC Catalogue
18. OpenAIRE
19. Harvard Library
20. National Library of Australia
21. Lens.org
22. CORE
23. J-Gate
24. Munich Personal RePEc Archive
25. Unpaywall
26. SINTA
27. Ulrichsweb
28. Elektronische Zeitschriftenbibliothek (EZB)
29. JournalTOCs
30. DOAJ
31. wisdom.ai
32. MIAR
33. ZDB
34. Open Ukrainian Citation Index (OUCI)
35. Norwegian Register for Scientific Journals, Series and Publishers
36. ERIC
37. fatcat!