ScienceDirect
1970
ScienceDirect
1971
ScienceDirect
1973
ScienceDirect
1976
ScienceDirect
1977
EBSCO Open Access Journals
2011-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2016-01-01 ~ 현재
Taylor & Francis Open
2016-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2025-01-01 ~ 현재
EBSCO Open Access Journals
1998-01-01 ~ 현재
OAPEN (Open Access Publishing in European Networks)
2022
DOAB Directory of Open Access Books
2022
Taylor & Francis eBooks (Open Access)
2022
ScienceDirect
2002-01-01 ~ 현재