DOAB Directory of Open Access Books
1996
De Gruyter Brill Open Access eBooks
1996
Project Muse Open Access ebooks
1983
DOAB Directory of Open Access Books
1973
EBSCO Open Access Journals
2006-01-01 ~ 2018-12-31
ScienceDirect
1966
ScienceDirect
1966
DOAB Directory of Open Access Books
2016
DOAJ: Directory of Open Access Journals
2008-01-01 ~ 현재
DOAB Directory of Open Access Books
2024
Books at JSTOR: Open Access
2026