1. DOAJ

2. Google Scholar

3. SINTA_ristek Dikti (Sinta 4)

4. Moraref

5. Dimensions

6. GARUDA-Garba Rujukan Digital

7. International Standard Serial Number

8. OneSearch Indonesia

9. Crossref

10. Leiden University Library

11. Boston University Library

12. University Library

13. Standford Libraries

14. Harvard Library

15. BASE (Bielefeld Academic Search Engine)

16. Semantic Scholar