DOAB Directory of Open Access Books
2024
ScienceDirect
2024
ScienceDirect
1973
ScienceDirect
2004
DOAB Directory of Open Access Books
2023
OAPEN (Open Access Publishing in European Networks)
2022
De Gruyter Brill Open Access eBooks
2022
DOAB Directory of Open Access Books
2022
DOAJ: Directory of Open Access Journals
2014-01-01 ~ 현재
PubMed Central (PMC)
2013-01-01 ~ 현재
OAPEN (Open Access Publishing in European Networks)
2026
DOAB Directory of Open Access Books
2026
EBSCO Open Access Journals
2002-01-01 ~ 2013-12-31