DOAB Directory of Open Access Books
2008
ScienceDirect
1968
Books at JSTOR: Open Access
2001
Brill Open e-Books
2001
OAPEN (Open Access Publishing in European Networks)
2001
DOAB Directory of Open Access Books
2001
DOAB Directory of Open Access Books
2005
DOAB Directory of Open Access Books
2009
DOAJ: Directory of Open Access Journals
2020-01-01 ~ 현재
OAPEN (Open Access Publishing in European Networks)
2000
OAPEN (Open Access Publishing in European Networks)
2023
DOAB Directory of Open Access Books
2023
DOAJ: Directory of Open Access Journals
2011-01-01 ~ 현재