DOAB Directory of Open Access Books
2017
DOAB Directory of Open Access Books
2023
OAPEN (Open Access Publishing in European Networks)
2022
DOAB Directory of Open Access Books
2022
DOAB Directory of Open Access Books
2012
DOAB Directory of Open Access Books
1976
Books at JSTOR: Open Access
1976
De Gruyter Brill Open Access eBooks
2021
Project Muse Open Access ebooks
1976
EBSCO Open Access Journals
2008-01-01 ~ 현재
DOAB Directory of Open Access Books
2019
Project Muse Open Access ebooks
2019
DOAJ: Directory of Open Access Journals
2000-01-01 ~ 현재
ScienceDirect
1991
DOAB Directory of Open Access Books
2024