1. Google Scholar.

2. Index Copernicus International (ICV 2019 = 96.82)

3. Europub (Directory of Academic and Scientific Journals)     

4. Navel Academic

5. Dimensions

6. Mendeley (Elsevier)

7. ScienceGate   

8. Sciete

9. Altmetric

10. Kudos

11. Crossref

12. ROAD

13. CORE