DOAB Directory of Open Access Books
2012
DOAJ: Directory of Open Access Journals
2011-01-01 ~ 현재
DOAJ: Directory of Open Access Journals
2018-01-01 ~ 현재
DOAB Directory of Open Access Books
2009
ScienceDirect
1960
ScienceDirect
2014
ScienceDirect
2020
DOAB Directory of Open Access Books
2021
DOAB Directory of Open Access Books
1998
De Gruyter Brill Open Access eBooks
1998
OAPEN (Open Access Publishing in European Networks)
2024
DOAB Directory of Open Access Books
2024