DOAB Directory of Open Access Books
2021
DOAB Directory of Open Access Books
2021
Books at JSTOR: Open Access
2021
De Gruyter Brill Open Access eBooks
2021
OAPEN (Open Access Publishing in European Networks)
2021
OAPEN (Open Access Publishing in European Networks)
2015
DOAB Directory of Open Access Books
2015
DOAJ: Directory of Open Access Journals
2017-01-01 ~ 현재
DOAB Directory of Open Access Books
2011
OAPEN (Open Access Publishing in European Networks)
2022
DOAB Directory of Open Access Books
2022
ScienceDirect
1990
DOAB Directory of Open Access Books
2025