ScienceDirect
1973
ScienceDirect
1984
DOAB Directory of Open Access Books
2016
ScienceDirect
2022
ScienceDirect
2025
ScienceDirect
1984
ScienceDirect
1972
OAPEN (Open Access Publishing in European Networks)
2016
DOAJ: Directory of Open Access Journals
2014-01-01 ~ 현재
EBSCO Open Access Journals
2016-01-01 ~ 현재