ScienceDirect
1971
DOAJ: Directory of Open Access Journals
2016-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2017-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2016-01-01 ~ 현재
DOAB Directory of Open Access Books
2004
DOAJ: Directory of Open Access Journals
2016-01-01 ~ 현재
ScienceDirect
2012
OAPEN (Open Access Publishing in European Networks)
2020
DOAB Directory of Open Access Books
2020
EBSCO Open Access Journals
1920-01-01 ~ 1922-12-31
DOAB Directory of Open Access Books
2019