Database Jurnal

Directory of Open Access Journals (DOAJ) – www.doaj.org
PubMed Central – www.ncbi.nlm.nih.gov/pmc
Public Library of Science (PLOS) – www.plos.org
ProQuest – https://www.proquest.com/
SpringerOpen – www.springeropen.com
ScientDirect – https://www.sciencedirect.com/