1. Sinta

2. Dimensions

3. Google Scholar

4. Moraref

5. ROAD

6. Crossref

7. Base

8. ResearchBib

9. Worldcat

10. EuroPub

11. Semantic Scholar

12. CiteFactor

13. Scilit

14. DRJI

15. Garba Rujukan Digital (Garuda)

16. Publons 

------------------------------------------------------------------------------------------------------------------------------------------------------------