2. Crossref
3. Garuda (Gerba Rujukan Digital)
4. OneSearch
5. BASE
6. ROAD (Directory of Open Access Scholarly Resources)
7. DIMENSIONS
8. Worldcat
9. ISJD
2. Crossref
3. Garuda (Gerba Rujukan Digital)
4. OneSearch
5. BASE
6. ROAD (Directory of Open Access Scholarly Resources)
7. DIMENSIONS
8. Worldcat
9. ISJD