1. Directory of Open Access Journals (DOAJ) – www.doaj.org
2. ResearchGate – www.researchgate.net
3. SpringerOpen – www.springeropen.com
4. Google Scholar – https://scholar.google.com
5. ProQuest – https://www.proquest.com
6. Academia.edu – https://www.academia.edu
7. International Journal of Education & the Arts – http://www.ijea.org
8. BioMed Central – www.biomedcentral.com
9. Perpustakaan Nasional (Perpusnas) – https://ejournal.perpusnas.go.id
10. Public Library of Science (PLOS) – www.plos.org
11. PubMed Central – www.ncbi.nlm.nih.gov/pmc
12. arXiv – arxiv.org
13. Hindawi – www.hindawi.com
14. Open Access Library – www.oalib.com